Cheesy Onion Scalloped Potatoes

Step 3: Make the Cheese Sauce

In a medium saucepan, melt 3 tablespoons of butter over medium heat.

Whisk in the flour and cook for about 1 minute to eliminate the raw flour taste. Gradually add the milk and cream while whisking continuously to prevent lumps from forming.

Continue stirring until the sauce thickens enough to coat the back of a spoon.

Add:

• Cheddar cheese
• Mozzarella cheese
• Garlic powder
• Paprika

Stir until the cheese melts completely and the sauce becomes smooth and creamy.

Season with salt and pepper to taste.

Step 4: Assemble the Layers

Preheat the oven to 375°F (190°C).

Grease a 9 x 13-inch baking dish.

Arrange one-third of the potato slices in an even layer across the bottom of the dish.

Top with:

• One-third of the cooked onions
• One-third of the cheese sauce

Repeat the layering process two more times until all ingredients have been used.

Finish with a generous layer of cheese sauce on top.

Step 5: Bake the Casserole

Cover the baking dish with aluminum foil.

Bake for 45 minutes.

After 45 minutes, remove the foil and continue baking for another 20–30 minutes. The top should become golden brown and the potatoes should be fork-tender.

If a darker crust is desired, place the dish under the broiler for 2–3 minutes at the end of baking, watching carefully to prevent burning.

Step 6: Rest Before Serving

Once baked, remove the casserole from the oven and allow it to rest for 10–15 minutes.

This resting period helps the sauce thicken and makes serving easier. The flavors also continue to develop as the dish cools slightly.

Serving Suggestions

Cheesy Onion Scalloped Potatoes pair beautifully with:

• Roast chicken
• Baked ham
• Grilled steak
• Pork loin
• Roasted vegetables

A crisp green salad or steamed vegetables provide a fresh contrast to the rich, creamy casserole.

Tips for Perfect Results

Choose the Right Potatoes

Starchy potatoes such as Russets create the creamiest texture, while Yukon Gold potatoes provide a buttery flavor and hold their shape well.

Slice Evenly

Consistent slices ensure all potatoes cook at the same rate.

Don’t Skip the Resting Time

Allowing the casserole to rest prevents the sauce from being overly loose when served.

Experiment with Cheese

Cheddar offers classic flavor, but Gruyère, Monterey Jack, or Gouda can add new dimensions of taste.

Final Thoughts

Cheesy Onion Scalloped Potatoes are the definition of comfort food. Layer after layer of tender potatoes, sweet onions, and creamy melted cheese create a dish that is hearty, satisfying, and irresistibly flavorful. Whether prepared for a holiday feast or a cozy family dinner, this classic casserole is sure to become a favorite that guests request again and again.