Prepare to elevate your culinary experience with a truly exceptional side dish: Potatoes Au Gratin with Bacon and Leeks. This isn’t just your grandmother’s classic gratin; it’s a sophisticated upgrade that marries the creamy, comforting layers of thinly sliced potatoes with the savory crunch of bacon and the delicate, sweet notes of sautéed leeks. Each forkful promises a symphony of textures and flavors, from the golden-brown, bubbly cheese crust to the tender, melt-in-your-mouth potato rounds bathed in a rich, flavorful sauce. Perfect for holidays, special occasions, or simply transforming a weeknight meal into something extraordinary, this recipe is guaranteed to impress.
Why This Potatoes Au Gratin Recipe is a Must-Try
While traditional au gratin potatoes are undoubtedly delicious, this enhanced version takes an already beloved classic to new heights. The genius lies in a few key additions and techniques that deepen the flavor profile and elevate the overall experience. Imagine tender, perfectly cooked potato slices, generously coated in a luxurious, cheesy sauce that’s been subtly infused with robust horseradish and tangy Dijon mustard. These aren’t just random additions; they are carefully selected components that cut through the richness of the cheese and cream, adding an unexpected but utterly delightful complexity that will have your guests asking for the recipe.
Beyond the decadent sauce, the crowning glory of this dish is its topping. Crispy, crumbled bacon introduces a smoky, salty counterpoint, while thinly sliced leeks, gently sautéed in the leftover bacon fat, contribute a sweet, onion-like aroma and a slightly caramelized texture. These elements don’t just garnish; they integrate seamlessly into the dish, creating layers of flavor and texture that make every bite an adventure. It’s a testament to how simple yet thoughtful additions can transform a great dish into an unforgettable culinary masterpiece.
Essential Ingredients for Your Elevated Au Gratin
Crafting the perfect Potatoes Au Gratin with Bacon and Leeks begins with selecting high-quality ingredients. Each component plays a crucial role in achieving the dish’s signature creamy texture, rich flavor, and irresistible aroma. For precise measurements and step-by-step instructions, please refer to the detailed recipe card at the end of this post.
Ingredient Spotlight & Smart Substitutions
Potatoes: The Heart of the Gratin
For au gratin, the choice of potato is paramount. We highly recommend using **Russet potatoes** (also known as Idaho potatoes) or **Yukon Gold potatoes**. Russets are excellent because their high starch content helps to naturally thicken the creamy sauce as they cook, resulting in that wonderfully cohesive texture we all love. They also become incredibly tender and readily absorb the rich flavors of the cheese sauce. Yukon Golds, on the other hand, offer a naturally buttery flavor and a slightly waxier texture that holds up beautifully, contributing to a rich mouthfeel.
The key to evenly cooked gratin is uniform slices. A mandoline slicer is an invaluable tool for achieving perfectly thin, consistent rounds, typically about 1/4-inch thick. If you don’t have a mandoline, a food processor with a slicing attachment or even a very sharp chef’s knife can be used. Just strive for the most even slices possible to ensure uniform cooking.
The Creamy, Flavorful Sauce
Our au gratin sauce takes a delightful twist on the traditional. While it incorporates classic ingredients like rich half-and-half and savory chicken broth for its creamy base, the secret weapons here are **horseradish sauce** and **Dijon mustard**. These two ingredients might seem unexpected, but they introduce a subtle piquant warmth and a tangy depth that beautifully complements the richness of the cheese and potatoes without overpowering them. They add a sophisticated layer of flavor that truly sets this recipe apart. Don’t be tempted to skip them!
Cheese: The Melty, Golden Crown
Au gratin is defined by its glorious cheese, and for the best results, quality matters. Always opt for a good block of cheese and shred it yourself. Pre-shredded bagged cheeses often contain anti-caking agents that can prevent smooth melting and sometimes lead to a slightly gritty sauce. For this recipe, we’ve found that a combination of **Gruyere** and **Fontina** cheeses delivers an incredible flavor and melt. Gruyere offers a nutty, earthy depth, while Fontina contributes a buttery, mild creaminess. Feel free to experiment with your favorite melting cheeses; other fantastic options include Parmesan for a sharp, salty kick, sharp cheddar for a more pronounced cheesy flavor, or Monterey Jack for its exceptional meltability.
The Irresistible Topping: Bacon and Leeks
While technically a garnish, the crispy crumbled **bacon** and delicate **sautéed leeks** are what truly make this dish an “upgrade.” They add layers of texture, smoky flavor, and a touch of elegance. The bacon offers a salty crunch and renders flavorful fat that is then used to gently sauté the leeks, infusing them with an incredible savory essence. Leeks have a mild, sweet onion flavor that becomes even sweeter and more tender when cooked. If leeks are unavailable, you can substitute them with thinly sliced shallots or even finely diced sweet onion, although the leek’s unique character is truly special here.
Crafting Potatoes Au Gratin with Bacon and Leeks: Step-by-Step
Creating this impressive side dish is simpler than you might think. Follow these detailed instructions to achieve a perfectly golden, bubbly, and creamy gratin every time. For a printable version of the full recipe, including exact measurements, please scroll to the end of this post.
- Prepare Your Oven and Baking Dish: Begin by preheating your oven to 400°F (200°C). Lightly spray the bottom of a 13×9 inch baking pan with cooking spray to prevent sticking. This ensures easy serving and cleanup.
- Slice and Soak Potatoes: Peel your chosen potatoes (Russet or Yukon Gold). Using a mandoline or a very sharp knife, slice the potatoes into thin, uniform rounds, approximately 1/4-inch thick. Immediately place the sliced potatoes into a large bowl of cold water. This prevents them from oxidizing and turning brown, and also helps to rinse off excess starch, contributing to a creamier sauce. Keep them submerged until ready to layer.
- Whisk the Flavorful Sauce: In a separate large bowl, combine the half-and-half, chicken broth, horseradish sauce, and Dijon mustard. Whisk these ingredients thoroughly until they are well combined and smooth. This is the secret sauce that infuses your gratin with incredible depth.
- First Potato Layer: Drain the potato slices well. Arrange one-third of the thinly sliced potatoes in an even layer across the bottom of your prepared baking pan. Try to overlap them slightly to create a solid base.
- First Sauce Layer: Pour one-third of the whisked broth mixture evenly over the potato layer. Ensure every potato slice gets a generous coating of this delicious liquid.
- First Cheese Layer: Sprinkle one-third of each of your shredded cheeses (Gruyere and Fontina) over the sauce-covered potatoes. This creates a wonderful cheesy blanket.
- Repeat the Layers: Repeat steps 4, 5, and 6 two more times, creating three distinct layers of potatoes, sauce, and cheese. For the final potato layer, you may want to lightly season it with garlic salt and black pepper to taste. Remember, cheese can be salty, so season judiciously.
- Bake to Golden Perfection: Place the uncovered baking dish into the preheated oven. Bake for approximately 1 hour, or until the potatoes are fork-tender and the top is beautifully golden brown and bubbly. If the top starts to brown too quickly, you can loosely tent it with aluminum foil for the remaining bake time.
- Prepare the Bacon Topping: While the potatoes are baking, cook 3 slices of bacon until crispy. Drain them on paper towels to remove excess grease. Once cooled, crumble or chop the bacon into small pieces.
- Sauté the Leeks: In the same pan, using about 1 tablespoon of the leftover bacon grease (or olive oil if preferred), sauté the thinly sliced leek rounds until they are tender and slightly caramelized, about 5-7 minutes. Drain them on paper towels. Remember to use the white part and a little of the green part of the leek, discarding the tough dark green tops.
- Final Touches: About 5 minutes before the potatoes are finished baking, carefully remove the dish from the oven. Evenly sprinkle the crumbled bacon and sautéed leeks over the golden-brown gratin. Return it to the oven for the remaining 5 minutes to allow the toppings to warm through and their flavors to meld.
- Rest and Serve: Allow the Potatoes Au Gratin to cool and rest for at least 10 minutes before serving. This crucial resting period allows the sauce to thicken and set, ensuring perfectly structured, creamy portions. Don’t worry if the sauce seems a little thin right out of the oven; it will continue to thicken as it cools.
Frequently Asked Questions & Expert Tips for Perfect Au Gratin
What kind of potatoes are best for au gratin?
Russet potatoes are generally considered the best choice due to their high starch content, which helps thicken the sauce and ensures super tender results. Yukon Gold potatoes are another excellent option, offering a naturally buttery flavor and a slightly firmer texture that holds its shape well. Both varieties absorb the creamy sauce beautifully.
What’s the difference between scalloped potatoes and potatoes au gratin?
The primary distinction between these two classic potato dishes lies in the cheese. While both feature thinly sliced potatoes baked in a creamy sauce, scalloped potatoes typically omit cheese, focusing solely on the rich cream base. Potatoes au gratin, on the other hand, always include cheese, both within the sauce and often as a delicious browned crust on top.
Can you make potatoes au gratin ahead of time?
Absolutely! Potatoes au gratin can be assembled a day in advance. Simply prepare the dish up to the baking step, cover it tightly with foil, and refrigerate. When you’re ready to bake, allow it to come closer to room temperature for about 30 minutes before placing it in the oven. You may need to add an extra 10-15 minutes to the baking time since the dish will be going into the oven cold. The bacon and leek topping is best added fresh just before the final few minutes of baking.
How do you store and reheat leftovers?
Store any cooled leftovers in an airtight container in the refrigerator for up to 4 days. To reheat, cover the dish with foil and bake in a 350°F (175°C) oven for about 15-20 minutes, or until thoroughly heated through. For extra moisture, you can add a splash of half-and-half or milk before reheating.
Additional Expert Tips:
- Cleaning Leeks: Leeks can trap a lot of grit and dirt between their layers. To clean them thoroughly, slice the leek rounds first, then place them in a bowl of cold water and swish them around. The dirt will sink to the bottom, allowing you to scoop out the clean leeks.
- Seasoning Strategy: We suggest seasoning the final potato layer with garlic salt and pepper, but you can season all three layers if you prefer. Keep in mind that cheese is inherently salty, so taste as you go and adjust accordingly. It’s easier to add salt than to remove it!
- Achieving the Perfect Crust: If your gratin isn’t browning sufficiently on top after an hour, you can place it under the broiler for 1-2 minutes, watching it very closely to prevent burning.
Elevate Your Meal: Serving Suggestions
Potatoes Au Gratin with Bacon and Leeks is a versatile side dish that complements a wide array of main courses, making it perfect for both festive holiday gatherings and elevated weeknight dinners. Its rich, creamy profile pairs beautifully with robust proteins.
- **For the Holidays:** Serve alongside a succulent roasted chicken, an elegant beef tenderloin, or a flavorful orange bourbon glazed ham. The richness of the gratin stands up wonderfully to these classic holiday centerpieces.
- **Everyday Elegance:** For a more casual yet equally delicious meal, pair it with pan-seared pork chops, roasted salmon, or a hearty meatloaf. The gratin can transform a simple meal into something truly special.
- **Complementary Sides:** To balance the richness, consider serving a light green salad with a vinaigrette dressing, steamed green beans, or roasted asparagus. These fresh vegetables add a nice contrast in flavor and texture.
- **Beverage Pairings:** A crisp Chardonnay, a light-bodied Pinot Noir, or even a dry hard cider would beautifully complement the creamy, savory notes of the dish.
The subtle, yet incredibly delicious flavors of this side dish make it truly exceptional. While it shines brightly during holidays and get-togethers, don’t hesitate to prepare a smaller batch for an intimate dinner. It’s a comforting indulgence that deserves to be enjoyed more often than just on special occasions.
Discover More Potato Recipes to Savor
If you love the versatility and comforting nature of potatoes, you’re in for a treat! Explore these other fantastic potato recipes that are sure to become new favorites in your kitchen:
- Melting Potatoes: Crispy on the outside, incredibly tender on the inside.
- Smashed Potatoes: Perfectly crispy and flavorful, a great alternative to fries.
- Crispy Roast Potatoes: A foolproof method for irresistibly golden-brown roasted potatoes.
- Bacon Three Cheese Potatoes: Another cheesy, bacon-infused potato sensation.
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Potatoes Au Gratin with Bacon and Leeks
A decadent and flavorful upgrade to classic au gratin, featuring secret ingredients for extra depth and a delicious bacon and leek topping.
Course: Sides
Cuisine: American
Servings: 6 servings
Prep Time: 20 mins
Cook Time: 1 hour
Total Time: 1 hr 20 mins
Calories: 470 kcal
Author: Amanda Davis
IMPORTANT – You’ll find frequently asked questions and expert tips within the blog post that may be very helpful. Scroll up to read them!
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Ingredients
- 3 pounds Russet potatoes, peeled and thinly sliced
- 1 cup half and half
- 1 cup chicken broth
- 3 Tablespoons horseradish sauce
- 2 teaspoons Dijon mustard
- 1 cup Gruyere cheese, shredded
- 1 cup Fontina cheese, shredded
- 3 slices bacon
- 1 leek, sliced into thin rounds (white and light green parts)
- Garlic salt, to taste
- Black pepper, to taste
Things You’ll Need
- 13×9 inch baking pan
- Mandoline or sharp knife/food processor with slicing attachment
Before You Begin
- For the leeks, you will use all of the white part and a little of the green. Ensure they are thoroughly cleaned to remove any grit.
- A mandoline ensures even potato slices, crucial for uniform cooking. If using a knife, aim for consistency.
- Shred your own block cheese; pre-bagged varieties can lead to a gritty sauce.
- Season the final potato layer to taste. Remember, cheese can be salty, so start light and adjust if needed.
Instructions
- Preheat oven to 400°F (200°C). Spray the bottom of a 13×9 inch pan with cooking spray.
- Peel potatoes and slice into thin rounds, about 1/4-inch thick. Place slices into a bowl of cold water until ready to use.
- In a large bowl, whisk together half and half, chicken broth, horseradish sauce, and Dijon mustard until well combined.
- Place one-third of the drained sliced potatoes into the bottom of the prepared pan.
- Pour one-third of the broth mixture over the potatoes.
- Sprinkle one-third of each of the shredded cheeses (Gruyere and Fontina) over the top.
- Repeat these layers two more times. If desired, sprinkle some garlic salt and pepper onto the last potato layer.
- Bake uncovered for 1 hour, or until potatoes are fork tender and the top is golden brown and bubbly.
- While the potatoes are baking, cook the bacon until crispy. Drain on paper towels. Once cool, crumble or chop the bacon slices.
- In 1 tablespoon of the bacon grease (or olive oil), sauté the leek rounds until tender. Drain on paper towels.
- With about 5 minutes of cook time left, remove potatoes from the oven and top with the crumbled bacon and sautéed leeks. Return to the oven for the remaining time.
- Cool for 10 minutes before serving. The sauce will thicken as it cools.
Expert Tips & FAQs
- Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. Reheat covered with foil in a 350°F (175°C) oven for about 15 minutes, adding a splash of milk or half-and-half for moisture if needed.
- This dish can be assembled a day in advance and refrigerated. Bake as normal, adding an extra 10-15 minutes to the baking time if starting cold.
Nutrition Information (per serving)
Serving: 1 serving | Calories: 470kcal | Carbohydrates: 46g | Protein: 20g | Fat: 23g | Saturated Fat: 13g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 7g | Trans Fat: 0.01g | Cholesterol: 72mg | Sodium: 640mg | Potassium: 1107mg | Fiber: 4g | Sugar: 5g | Vitamin A: 808IU | Vitamin C: 17mg | Calcium: 432mg | Iron: 2mg
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The recipes on this blog are tested with a conventional gas oven and gas stovetop. It’s important to note that some ovens, especially as they age, can cook and bake inconsistently. Using an inexpensive oven thermometer can assure you that your oven is truly heating to the proper temperature. If you use a toaster oven or countertop oven, please keep in mind that they may not distribute heat the same as a conventional full sized oven and you may need to adjust your cooking/baking times. In the case of recipes made with a pressure cooker, air fryer, slow cooker, or other appliance, a link to the appliances we use is listed within each respective recipe. For baking recipes where measurements are given by weight, please note that results may not be the same if cups are used instead, and we can’t guarantee success with that method.