Ingredients
- Potatoes: 3 pounds, Yukon Gold or Russet, peeled and thinly sliced (about 1/8 inch thick). Yukon Golds offer a creamy texture, while Russets are starchier and hold their shape well, both work wonderfully in this recipe.
- Yellow Onion: 1 medium, thinly sliced. Adds a subtle savory sweetness that complements the potatoes and cheese.
- Garlic: 2 cloves, minced. Infuses the creamy sauce with a pungent and aromatic depth.
- Butter: 1/2 cup (1 stick), unsalted. Forms the base of the roux and adds richness to the sauce.
- All-Purpose Flour: 1/4 cup. Used to create a roux with the butter, thickening the milk and cream into a luscious sauce.
- Milk: 2 cups, whole milk recommended. Provides a creamy base for the sauce, adding body and richness.
- Heavy Cream: 1 cup. Enhances the creaminess and richness of the sauce, making it truly decadent.
- Sharp Cheddar Cheese: 2 cups, shredded. Offers a classic cheesy flavor that pairs perfectly with potatoes. Use freshly shredded cheese for the best melting consistency.
- Gruyere Cheese: 1 cup, shredded. Adds a nutty, slightly complex flavor that elevates the cheese sauce. You can substitute with Monterey Jack or Fontina for a milder taste.
- Nutmeg: 1/4 teaspoon, ground. A subtle spice that enhances the savory flavors of the dish and adds a touch of warmth.
- Dried Thyme: 1/2 teaspoon. Lends an earthy, herbaceous note that complements the potatoes and cheese beautifully.
- Salt: 1 1/2 teaspoons, or to taste. Essential for seasoning and bringing out the flavors of all the ingredients.
- Black Pepper: 1/2 teaspoon, freshly ground, or to taste. Adds a touch of spice and depth of flavor.
- Fresh Parsley: 2 tablespoons, chopped, for garnish (optional). Provides a fresh, vibrant finish and visual appeal.
Instructions
- Preheat Oven and Prepare Baking Dish: Preheat your oven to 375°F (190°C). Lightly grease a 9×13 inch baking dish with butter or cooking spray. This prevents the potatoes from sticking and ensures easy cleanup.
- Prepare the Potatoes and Onions: Peel the potatoes and thinly slice them to about 1/8 inch thickness. Using a mandoline, food processor with a slicing blade, or a sharp knife will ensure even slices that cook uniformly. Thinly slice the yellow onion as well. Set both aside. To prevent the potatoes from browning, you can submerge them in a bowl of cold water while you prepare the sauce. Drain and pat them dry before layering.
- Sauté Onions and Garlic: In a large saucepan or Dutch oven, melt the butter over medium heat. Add the sliced onions and cook until softened and translucent, about 5-7 minutes. Stir occasionally to prevent browning. Add the minced garlic and cook for another minute until fragrant, being careful not to burn the garlic. Burnt garlic can impart a bitter taste.
- Make the Roux: Sprinkle the all-purpose flour over the onions and garlic in the saucepan. Cook, stirring constantly with a whisk, for 1-2 minutes. This creates a roux, which is the foundation for your creamy sauce. Cooking the flour removes the raw flour taste and ensures a smooth sauce.
- Create the Cheese Sauce: Gradually whisk in the milk and heavy cream, a little at a time, ensuring each addition is fully incorporated before adding more. Continue whisking until the sauce is smooth and starts to thicken slightly. This process prevents lumps and ensures a velvety sauce. Bring the sauce to a gentle simmer, stirring constantly, and cook for 2-3 minutes until it thickens enough to lightly coat the back of a spoon. Be careful not to boil the sauce vigorously, as this can cause it to separate.
- Stir in Cheese and Seasonings: Remove the saucepan from the heat. Stir in the shredded cheddar cheese and Gruyere cheese, stirring until the cheese is completely melted and the sauce is smooth and cheesy. Season the sauce with salt, black pepper, ground nutmeg, and dried thyme. Taste and adjust seasonings as needed. A pinch of cayenne pepper can add a subtle kick if desired.
- Layer Potatoes and Sauce: Begin layering the sliced potatoes in the prepared baking dish. Arrange about one-third of the potato slices in an even layer on the bottom of the dish, slightly overlapping them. Pour about one-third of the cheese sauce evenly over the potatoes. Repeat the layers two more times, ending with a layer of cheese sauce on top. Ensure the potatoes are mostly submerged in the sauce to prevent them from drying out during baking.
- Bake the Scalloped Potatoes: Cover the baking dish tightly with aluminum foil. This helps the potatoes steam and cook through evenly. Bake in the preheated oven for 1 hour. After 1 hour, remove the foil and continue baking for another 30-45 minutes, or until the potatoes are tender when pierced with a fork and the top is golden brown and bubbly. The baking time may vary depending on your oven and the thickness of your potato slices.
- Rest Before Serving: Once baked, remove the scalloped potatoes from the oven and let them rest for 10-15 minutes before serving. This allows the sauce to thicken slightly and the flavors to meld together. Garnish with fresh chopped parsley, if desired, before serving.
Nutrition
- Serving Size: one normal portion
- Calories: 400
- Fat: 25g