Side Dishes
Mastering Campbell’s au gratin potatoes transforms a simple side dish into a showstopping centerpiece that rivals restaurant-quality preparations. The secret lies in thinly sliced potatoes layered with a creamy, cheesy sauce that develops a golden, crispy top while staying tender inside—a technique perfected over decades.
I’ve tested countless variations, and this method delivers consistent results every time, whether you’re serving a holiday feast or a weeknight dinner that deserves applause.
The foundation of great au gratin potatoes starts with proper potato preparation: thin, even slices that cook uniformly without turning mushy. A classic roux-based sauce—made with butter, flour, and milk—creates the velvety base, while sharp cheddar and Gruyère deliver that signature depth of flavor.
The key to the crispy top? A final sprinkle of breadcrumbs and cheese baked until bubbly and golden, creating a contrast of textures that makes each bite irresistible.
What you’ll achieve is a dish that’s creamy, cheesy, and impossibly crispy at the same time—layers of tender potatoes enveloped in a rich, savory sauce with a caramelized crust that holds its shape.
This recipe serves as both a comforting classic and a versatile side, pairing beautifully with roasted meats, grilled fish, or even as the star of a vegetarian spread. The aroma alone will have everyone at the table anticipating the first bite.
Ready in about 45 minutes, this dish requires minimal effort but maximum attention to layering and baking time. The result? A side dish so impressive, it’ll have your guests asking for the recipe—and wondering why they haven’t made it themselves. Let’s get started on creating this cheesy, crisp-top masterpiece.
Ingredients for campbell's au gratin potatoes
Thinly sliced potatoes, velvety roux, and two cheeses create this restaurant-worthy side dish.
| Ingredient | Amount | Notes |
|---|---|---|
| Russet Potatoes 🥔 | 3 lb | Thinly sliced (1/8-inch), peeled |
| Unsalted Butter 🧈 | ¾ cup | Cold, cut into small cubes |
| All-Purpose Flour 🌾 | ¾ cup | For roux, sifted if lumpy |
| Whole Milk 🥛 | 2 ½ cups | Full-fat for creaminess |
| Sharp White Cheddar Cheese 🧀 | 1 ½ cups | Shredded, block preferred |
| Gruyère Cheese 🧀 | 1 cup | Shredded, aged minimum 12 months |
| Freshly Ground Black Pepper 🌶️ | 1 ½ tsp | Cracked, not powdered |
| Diamond Crystal Kosher Salt 🧂 | 1 ½ tsp | Fine grain, adjust to taste |
| Garlic Cloves 🧄 | 4 cloves | Minced, fresh preferred |
| Dry Breadcrumbs 🍞 | ½ cup | Panko for extra crispiness |
| Fresh Nutmeg 🌿 | ¼ tsp | Finely grated, aromatic |
| Heavy Cream 🥛 | ½ cup | Optional, for extra richness |
| Fresh Thyme Leaves 🌿 | 1 tbsp | Chopped, stems removed |
The potatoes are the foundation—Russet potatoes with their high starch content hold up best to thin slicing. Use a mandoline for perfect 1/8-inch slices, or carefully hand-slice with a sharp chef's knife. Whole Foods Market and Trader Joe's carry pre-sliced Russets in the refrigerated section, but fresh-cut delivers superior texture. For the roux, European-style butter like Plugrá or Éram adds depth, though high-quality American brands work fine. The key is patience: cook the roux low and slow to avoid burning, or you'll taste the bitterness in every bite. Gruyère should be aged at least 12 months—you'll know it's good when it's nutty and melts like silk.
No sharp cheddar? Pepper Jack or aged Gouda add complexity, though Gruyère is non-negotiable for that authentic flavor. Running short on Gruyère? Comté or Emmental work in a pinch, though the texture will differ slightly. Fresh thyme is ideal, but dried thyme at one-third the amount suffices if you're in a hurry. For extra richness, substitute half the milk with heavy cream—it's worth the extra cost for that velvety finish. The breadcrumbs should be dry panko for maximum crispiness; regular breadcrumbs absorb too much moisture. If you can't find panko, toast regular breadcrumbs in a dry skillet for 2-3 minutes until golden.
This dish reheats beautifully—350°F for 15-20 minutes covered with foil, then uncovered until bubbly. Store leftovers in an airtight container for up to 4 days, though the crispy top softens with time. For make-ahead prep, assemble the dish in a baking dish, cover with foil, and refrigerate for up to 24 hours before baking. The flavors meld beautifully overnight, and the extra chilling ensures a crispier top. Freeze baked portions for up to 3 months—reheat covered with foil to prevent drying. The cheese sauce can be made up to 3 days ahead and stored in the fridge.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this for nights when I’d rather not wash a million dishes—just slice those Russets, toss them in the oven, and let the cheese do all the work. The butter and flour roux makes it creamy without extra pots.
- Cheese Overload: That sharp white cheddar? It’s the star—melty, tangy, and so satisfying when it pulls into crispy bits on top. Honestly, I’ll take this over any sad store-bought version.
- Game for Any Meal: Serve it as a side for steak night, pile it on a plate for a lazy Sunday brunch, or even stuff it into a baked potato for a hearty lunch. It’s the ultimate blank canvas.
- Budget-Friendly Luxury: Russets and cheddar stretch far, and the milk-butter roux feels fancy without breaking the bank. Plus, leftovers reheat like a dream—just pop them back in the oven for that golden crust.
Step-by-step instructions for Campbell's au gratin potatoes recipe
Master this classic technique for perfectly layered, golden-topped au gratin potatoes every time.
Prepare the Potatoes for Even Cooking
Peel the 3 lb russet potatoes and slice them into even ⅛-inch thick rounds using a mandoline or sharp knife. I find the mandoline gives the most consistent thickness, which is crucial for even cooking. Soak the sliced potatoes in cold water for 10 minutes to remove excess starch, then drain and pat completely dry with paper towels. This step prevents a gummy texture and ensures the potatoes absorb the creamy sauce properly.
Arrange the potato slices in a single layer on a baking sheet, ensuring they don't overlap. I like to fan them out slightly so they dry evenly. This pre-drying helps create that signature crispy top layer later. Let them sit uncovered at room temperature for 20 minutes before assembly, allowing any remaining surface moisture to evaporate completely.
Create the Creamy Cheese Sauce Foundation
In a large saucepan, melt the 0.75 cup unsalted butter over medium heat until completely liquid. Whisk in the 0.75 cup all-purpose flour and cook for 2-3 minutes until the mixture forms a smooth, bubbling roux. This step is critical—it removes the raw flour taste and creates the velvety texture of the sauce.
Slowly whisk in the 2.5 cups whole milk, about ½ cup at a time, allowing each addition to incorporate completely before adding more. Return the mixture to a gentle simmer and cook for 5-7 minutes until slightly thickened. Stir in the 1.5 cups sharp white cheddar cheese and 1 cup gruyère cheese, scraping the bottom of the pan to incorporate any browned bits. Season with the 1.5 tsp freshly ground black pepper, 1.5 tsp diamond crystal kosher salt, and 0.25 tsp fresh nutmeg. Remove from heat and stir in the 0.5 cup heavy cream and 1 tbsp fresh thyme leaves.
Layer Potatoes and Sauce for Perfect Texture
Preheat your oven to 375°F. In a 9x13-inch baking dish, spread half of the potato slices in a single layer on the bottom. Pour half of the cheese sauce evenly over the potatoes, then sprinkle half of the 0.5 cup dry breadcrumbs. Repeat with the remaining potato slices, sauce, and breadcrumbs, finishing with a final layer of breadcrumbs on top. This layering technique ensures each potato slice gets coated in sauce while creating that coveted crispy crust.
Press down gently on the top layer to help the potatoes settle and absorb the sauce. This prevents them from shifting during baking. The breadcrumbs will form a golden-brown crust while the potatoes cook through to creamy perfection underneath. For best results, let the assembled dish rest at room temperature for 15 minutes before baking to allow the flavors to meld slightly.
Bake Until Golden and Bubbly
Bake the au gratin potatoes uncovered for 50-60 minutes. You'll know they're ready when the top is deeply golden brown and the edges are bubbling vigorously. The potatoes should be tender when pierced with a fork, with no resistance at the center. If the top isn't brown enough after 50 minutes, broil for 2-3 minutes at the end, watching closely to prevent burning.
During the final 10 minutes of baking, I like to place the dish on a cooling rack over a baking sheet. This allows hot air to circulate underneath, promoting even browning on the bottom layers as well. Remove from the oven and let rest for 10 minutes before serving. This resting period allows the layers to set slightly, making it easier to slice and serve without losing that perfect creamy texture.
Garnish and Serve Immediately
Before serving, sprinkle with additional freshly ground black pepper and a few extra breadcrumbs for enhanced texture. The dish should be bubbling hot with a crispy, golden top that contrasts beautifully with the creamy interior. Serve immediately while hot, as au gratin potatoes are best enjoyed straight from the oven when the sauce is at its peak creaminess.
Each bite should deliver tender, fluffy potatoes perfectly enrobed in rich, cheesy sauce with a satisfying crunch from the breadcrumb topping. For an extra touch, I like to serve with a simple green salad and a crisp white wine to complement the dish's creamy, cheesy character. The key to success lies in the precise layering and proper baking technique—don't rush either step for best results.
Pro Tips For Making Campbell'S Au Gratin Potatoes
- USE COLD POTATOES DIRECTLY: Skip the boiling step—this recipe works better when you slice the Russets thin (about 1/8-inch) and layer them raw. The starch will release as they bake, creating a creamier texture. I learned this the hard way after boiling mine first and ending up with gluey layers.
- WHISK THE ROUX HOT: Melt 4 tablespoons of butter in a saucepan over medium-high heat, then whisk in the flour all at once. Cook for 2 minutes until it’s a deep golden color—this isn’t the time to rush. The flavor develops fast, and skipping this step leaves your cheese sauce tasting flat.
- PRESS OUT AIR FROM CHEESE: Before sprinkling the cheddar, press it through a fine-mesh sieve or grate it with a box grater—no need for pre-shredded. Pack the cheese tightly between layers to prevent gaps, which is where soggy spots hide. Yes, it’s extra work, but your au gratin will stay crispy longer.
- BAKE UNTIL GOLDEN, NOT JUST BUBBLY: Cover the dish with foil for the first 45 minutes, then uncover and crank the oven to 425°F for the last 15. Watch for a deep golden crust, not just bubbles—this is where the magic happens. I used to pull it out too soon, and the top stayed pale and sad.
Storing and reheating this campbell's au gratin potatoes
Refrigerator Storage
Store leftovers in an airtight container with a lid to preserve moisture and prevent drying. I use glass Pyrex containers because they distribute heat evenly when reheating.
Keep your au gratin potatoes refrigerated at 40°F or below for up to 4 days—the flavors actually deepen overnight as the spices meld. Just be aware the crispy top may soften slightly after the first day. 🥔
Freezer Storage
For longer storage, freeze baked portions in a single layer on a tray before transferring to freezer-safe bags or containers. Label with the date and freeze for up to 3 months. When ready to eat, thaw overnight in the refrigerator before reheating.
The texture remains creamy, though the top will be softer than fresh-baked. For best results, reheat covered with foil to trap moisture. ❄️
Stovetop Reheating
My preferred method is stovetop reheating in a heavy-bottomed skillet—it maintains the creamy texture beautifully. Cover the dish with foil and warm over medium-low heat for 15-20 minutes, adding 2 tablespoons of milk or cream if it looks dry.
The gentle heat prevents the cheese from separating, and the foil traps steam to keep everything moist. Stir gently once to redistribute the sauce. 🔥
Oven Reheating
For a crispy top, reheat in a 350°F oven covered with foil for 15 minutes, then uncover and broil for 2-3 minutes until golden. This method restores that satisfying crunch while keeping the potatoes tender.
Place the dish on a baking sheet to catch any drips, and watch closely to avoid over-browning. The oven method is ideal for serving directly from the dish. 🌡️
Microwave Method
For quick reheating, cover the dish with a damp paper towel and microwave on 50% power in 1-minute intervals, stirring between each. This prevents uneven heating that can make the top rubbery.
Add 1 tablespoon of milk or water if the sauce looks thickened. While not as crispy as oven-reheated, this method works in a pinch for busy weeknights. ⏰
Make-Ahead Assembly
Save time by assembling the dish in a baking dish, covering with foil, and refrigerating for up to 24 hours before baking. The extra chilling time helps develop a crispier top when baked.
Alternatively, prepare the cheese sauce ahead and store it in the fridge for 3 days—just reheat gently before layering with potatoes. This is my go-to strategy for holiday meals when timing is tight. 💡
Nutrition facts
Frequently asked questions
Can I use Campbell's cream of mushroom soup instead of making the roux from scratch?
For a shortcut version, use 2 cups of Campbell's cream of mushroom soup as the base instead of the roux. Stir in 1 cup milk to thin it slightly, then add the cheeses and seasonings. The texture will be slightly different but still delicious. This works especially well for weeknight dinners when you're short on time.
Why did my au gratin potatoes turn out mushy instead of creamy?
Mushy texture usually happens when potatoes weren't sliced evenly or weren't dried properly before baking. Always slice potatoes ⅛-inch thick and pat them completely dry after soaking. Also, avoid overbaking—they should be tender but still hold their shape when pierced with a fork. The sauce should coat the potatoes, not pool at the bottom.
What's the best way to make this dish ahead of time?
Assemble the dish completely in a baking dish, cover tightly with foil, and refrigerate for up to 24 hours before baking. The extra chilling time actually helps create a crispier top when baked. Alternatively, make the cheese sauce ahead and store it in the fridge for 3 days—just reheat gently before layering with the potatoes. This is perfect for holiday meals!
Can I make this dish vegetarian?
This recipe is already vegetarian! The classic version uses dairy and potatoes only. For a vegan adaptation, substitute the butter with vegan butter, use plant-based milk, and replace the cheeses with vegan cheeses like Miyoko's or Violife. The texture will be slightly different but still delicious. The dish maintains its creamy, cheesy character even without animal products.
How do I get the perfect crispy top every time?
The secret is in the layering and timing. Use dry panko breadcrumbs for the topping and press them gently into the sauce before baking. Let the assembled dish rest at room temperature for 15 minutes before baking to help the top set. Bake uncovered at 375°F for 50-60 minutes, then broil for 2-3 minutes at the end if needed. The key is patience—don't rush the baking process!