Cheesy Onion Scalloped Potatoes

Making the Creamy Cheese Sauce

In the same skillet, melt a little extra butter if needed. Sprinkle in the flour and whisk continuously for about one minute to create a smooth roux. Slowly pour in the milk and cream while whisking to prevent lumps from forming.

Continue stirring until the sauce thickens into a smooth and creamy consistency. Add garlic powder, salt, black pepper, and paprika for seasoning. Reduce the heat and stir in about half of the shredded cheddar cheese until melted and smooth.

The sauce should be rich, creamy, and flavorful because it will coat every layer of potatoes during baking.

Layering the Casserole

Preheat the oven to 375°F (190°C). Grease a large baking dish with butter or cooking spray.

Arrange a layer of potato slices across the bottom of the dish. Add a portion of the cooked onions over the potatoes, then spoon some of the cheese sauce on top. Repeat the layers until all ingredients are used, finishing with sauce on the top layer.

Sprinkle the remaining shredded cheddar cheese evenly across the surface. This final layer creates the delicious golden crust that makes scalloped potatoes so appealing.

Baking the Dish

Cover the baking dish with aluminum foil and place it into the preheated oven. Bake for about 45 minutes to allow the potatoes to soften and absorb the creamy sauce.

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

If you prefer an extra crispy cheesy topping, place the dish under the broiler for a few minutes at the end of baking. Watch carefully to avoid burning.

Resting Before Serving

Once baked, remove the casserole from the oven and let it rest for about 10 minutes before serving. Resting allows the sauce to thicken slightly and helps the layers hold together when sliced.

Serve the cheesy onion scalloped potatoes warm as a side dish alongside roasted turkey, baked ham, steak, or grilled vegetables. The creamy potatoes and sweet onions create a perfect balance of flavors that complement many meals.

Tips for the Best Cheesy Onion Scalloped Potatoes

• Slice the potatoes evenly so they cook at the same rate.
• Use freshly shredded cheese for smoother melting and better flavor.
• Caramelizing the onions slowly enhances their natural sweetness.
• Do not skip the resting time after baking because it improves texture.
• Add herbs such as thyme or parsley for additional flavor.

Storing and Reheating

Leftover scalloped potatoes can be stored in an airtight container in the refrigerator for up to four days. Reheat portions in the oven or microwave until warmed through.

The flavors often become even richer the next day, making leftovers especially delicious.

Final Thoughts

Cheesy Onion Scalloped Potatoes are the ultimate comfort-food casserole. The tender layers of potatoes, creamy homemade cheese sauce, and sweet onions combine into a dish that feels both rustic and indulgent. Perfect for family gatherings, potlucks, holidays, or simple weeknight dinners, this recipe delivers warmth and satisfaction in every bite.

With its golden cheesy top and rich creamy interior, this timeless potato dish is guaranteed to become a favorite at your table.