A creamy, cheesy, and classic scalloped potato dish that’s guaranteed to come out perfect every time. Ideal as a comforting side dish for any meal.

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Preheat oven to 350°F (175°C).
In a medium saucepan, melt butter over medium heat.
Stir in flour and cook for 1 minute, stirring constantly to form a roux.
Gradually whisk in milk, ensuring there are no lumps.
Cook until the sauce thickens, then season with salt, pepper, and onion powder if using.
In a greased 2-quart baking dish, layer half of the sliced potatoes.
Pour half of the sauce over the potatoes. If using cheese, sprinkle some over the layer.
Repeat with remaining potatoes and sauce (and cheese if using).
Cover with foil and bake for 30 minutes.
Remove foil and bake an additional 30-35 minutes, until potatoes are tender and top is golden.
Let rest for 5-10 minutes before serving.