Ingredients
- 4 russet potatoes, peeled and sliced into ¼-inch slices (about 2 pounds)
Russet potatoes are perfect for this recipe because of their starchy texture, which helps thicken the sauce while baking. - 1 yellow onion, sliced into rings
The onions add a subtle sweetness and depth of flavor to the dish. - 3 tablespoons unsalted butter
Butter is used to create the roux for the cheese sauce, adding richness and a creamy base. - 3 tablespoons all-purpose flour
Flour helps thicken the cheese sauce, making it velvety smooth and perfect for coating the potatoes. - ½ teaspoon kosher salt
Enhances the flavor of the dish while balancing the cheese’s richness. - 2 cups whole milk (room temperature)
Milk provides the creaminess needed for the sauce without making it too heavy. - 1 ½ cups mild cheddar cheese, shredded
Cheddar cheese melts beautifully, delivering a cheesy flavor without overwhelming the dish. - Salt and pepper, to taste
Season to your liking once the dish is finished baking.
Instructions
Step 1: Preheat the Oven
Preheat your oven to 400°F (200°C). Lightly spray an 8×8-inch casserole dish with nonstick cooking spray to prevent the potatoes from sticking.
Step 2: Layer the Potatoes and Onions
In the prepared baking dish, arrange the potato slices and onion rings in alternating layers. Begin with a layer of potatoes, followed by onions, and repeat until the ingredients are used up.
Step 3: Make the Cheese Sauce
In a medium-sized saucepan, melt the butter over medium heat. Once melted, whisk in the flour and salt, stirring constantly to create a smooth roux. Cook for one minute to remove the raw flour taste.
Gradually stir in the room-temperature milk, continuing to whisk until the mixture thickens. This should take around 5 minutes. Once thickened, add the shredded cheddar cheese and stir until completely melted and smooth—about 30 to 60 seconds.
Step 4: Pour the Cheese Sauce Over the Potatoes
Carefully pour the cheese sauce evenly over the layered potatoes and onions in the casserole dish. Cover the dish tightly with aluminum foil to trap the steam and ensure even cooking.
Step 5: Bake
Place the casserole dish in the oven and bake for 85-90 minutes. The potatoes should be tender when pierced with a fork.
Step 6: Broil for a Crisp Top (Optional)
If you prefer a crispy, golden-brown topping, remove the foil after baking and switch your oven to broil. Broil the potatoes for 2-3 minutes, watching closely to avoid burning.
Step 7: Season and Serve
Once baked, season the dish with additional salt and pepper to taste. Let the scalloped potatoes rest for a few minutes before serving, as this will allow the sauce to thicken further.
Notes
Serving and Presentation Tips
Presentation is key when serving a beautiful dish like cheesy scalloped potatoes. To make your dish look restaurant-worthy, sprinkle some freshly chopped parsley or chives on top for a pop of color. You can also serve the dish in individual ramekins for a more elegant presentation, especially for special occasions.
- Prep Time: 15 minutes
- Cook Time: 85-90 minutes
- Category: Dinner