A classic, creamy scalloped potato dish that’s rich, cheesy, and guaranteed to come out perfect every time. Ideal for holidays or family dinners.

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Preheat oven to 375°F (190°C). Grease a 2-quart baking dish.
In a medium saucepan, melt butter over medium heat. Add chopped onion and sauté until softened, about 2-3 minutes.
Stir in flour and cook for 1 minute to form a roux.
Gradually whisk in milk and cook, stirring constantly, until thickened, about 5 minutes.
Season with salt, pepper, and garlic powder. Stir in 1 cup of the shredded cheese until melted and smooth.
Layer half of the sliced potatoes in the prepared baking dish. Pour half of the cheese sauce over the top.
Repeat with remaining potatoes and sauce. Sprinkle the remaining 1/2 cup of cheese on top.
Cover with foil and bake for 30 minutes. Uncover and bake an additional 25-30 minutes, or until potatoes are tender and top is golden brown.
Let sit for 10 minutes before serving.