Step 3: Make the Creamy Cheese Sauce
Once the onions are softened, sprinkle the flour over them and stir well. Cook for about 1 minute to remove the raw flour taste.
Slowly pour in the milk while whisking continuously to avoid lumps. Then add the heavy cream if using.
Keep stirring over medium heat until the mixture thickens slightly—this should take about 3–5 minutes.
Now add salt, pepper, garlic powder, and about 1½ cups of shredded cheese. Stir until the cheese melts completely into a smooth, creamy sauce.
Taste and adjust seasoning if needed.
Step 4: Layer the Potatoes
Preheat your oven to 375°F (190°C).
Drain the potato slices and pat them dry with a clean towel.
Grease a baking dish with butter or nonstick spray.
Start layering:
- First layer: potatoes
- Second layer: cheese-onion sauce
- Repeat until all ingredients are used, finishing with sauce on top
Sprinkle the remaining cheese evenly over the top layer. Add a light pinch of paprika if you want a slightly golden finish.
Step 5: Bake the Dish
Cover the baking dish with aluminum foil and bake for 45 minutes.
Then remove the foil and bake for another 25–35 minutes until:
- The top is golden and bubbly
- A knife slides easily through the potatoes
- The sauce is thick and creamy
If you want a crispier top, broil for 2–3 minutes at the end, but watch closely so it doesn’t burn.
Step 6: Let It Rest
Once out of the oven, let the dish rest for 10–15 minutes. This step is important because it allows the sauce to thicken and settle, making it easier to serve clean portions.
Serving Suggestions
Cheesy Onion Scalloped Potatoes pair perfectly with:
- Roast chicken or turkey
- Grilled steak
- Baked ham
- Simple green salad for balance
They also reheat very well, making them great for leftovers.
Final Tip
For extra depth of flavor, you can caramelize the onions instead of just softening them, or mix different cheeses like sharp cheddar and Gruyère. Small changes like this can turn a simple side dish into something truly unforgettable.
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