Description
A cozy and indulgent au gratin potatoes recipe featuring tender, creamy potatoes layered with a velvety béchamel sauce and topped with a perfectly crispy cheese crust. Ideal for gatherings, holiday dinners, or comforting weeknight meals.
Ingredients
- 2 pounds (900g) Russet or Yukon Gold potatoes, thinly sliced (about 1/8 inch thick)
- 4 tablespoons (60g) unsalted butter
- 1/4 cup (30g) all-purpose flour
- 2 cups (480ml) whole milk, warmed
- 3 cloves garlic, minced (about 1 tablespoon)
- 1 cup (100g) sharp cheddar cheese, shredded
- 1 cup (100g) Gruyère cheese, shredded
- 1 1/2 teaspoons salt
- 1/2 teaspoon freshly ground black pepper
- 1 tablespoon fresh thyme leaves (optional)
- 1/2 cup (50g) panko breadcrumbs
- 1 tablespoon melted butter (for mixing with breadcrumbs)
Instructions
- Prep Your Potatoes and Garlic (10 minutes): Peel potatoes if desired. Slice thinly about 1/8 inch thick using a mandoline or sharp knife. Toss slices in a large bowl with minced garlic, salt, pepper, and fresh thyme leaves. Set aside.
- Make the Béchamel Sauce (10 minutes): In a medium saucepan, melt butter over medium heat. Whisk in flour and cook for about 2 minutes to form a roux. Slowly pour in warmed milk while whisking vigorously to avoid lumps. Continue whisking until sauce thickens and coats the back of a spoon, about 5 minutes. Remove from heat and stir in half of the shredded cheddar and Gruyère until melted and smooth. Adjust salt and pepper to taste.
- Layer the Potatoes and Sauce (5 minutes): Preheat oven to 375°F (190°C). Lightly butter a 9×13-inch baking dish. Arrange a layer of potato slices on the bottom, overlapping slightly. Pour a ladle of cheese sauce over the potatoes, spreading evenly. Repeat layering potatoes and sauce until all are used, finishing with sauce on top.
- Add Cheese and Breadcrumb Topping (2 minutes): Sprinkle remaining shredded cheeses evenly over the top. Mix panko breadcrumbs with melted butter and sprinkle over the cheese layer to create a crispy crust.
- Bake Until Golden and Bubbling (45-55 minutes): Place the dish uncovered on the middle oven rack. Bake for about 45 minutes until cheese is bubbly and golden brown. If top browns too quickly, tent with foil and continue baking until potatoes are tender when pierced with a fork.
- Rest Before Serving (10 minutes): Let the au gratin potatoes rest for at least 10 minutes before serving to allow the sauce to thicken and make slicing easier.
Notes
Warm the milk before adding to the roux to prevent lumps. Slice potatoes uniformly for even cooking. Use a mix of sharp cheddar and Gruyère for the best flavor and crispy crust. Freshly grate cheese instead of using pre-shredded for better melting and crust texture. Panko breadcrumbs add extra crunch. Let the dish rest before serving to firm up the sauce. This recipe can be assembled a day ahead and refrigerated; add 10-15 minutes to baking time if baking from cold. Tent with foil if the top browns too quickly.
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Category: Side Dish
- Cuisine: French
Nutrition
- Serving Size: 1/6 of the casserole
- Calories: 350
- Sodium: 400
- Fat: 18
- Saturated Fat: 10
- Carbohydrates: 40
- Fiber: 3
- Protein: 12
Keywords: au gratin potatoes, creamy potatoes, cheesy potatoes, crispy cheese crust, comfort food, side dish, holiday recipe, cozy meals