Creamy Cheesy Scalloped Potatoes

Instructions

1. Preheat the oven to 400°F.
2. Melt the butter in a medium sauce pan over medium heat. Once melted, add the onions and saute them until they're translucent, about 5 minutes.
3. Sprinkle the onions with the salt and pepper, add the flour and stir it to form a paste. Let it cook for 1 minute longer.
4. Pour in the milk all at once, whisking intermittently until it starts to become thick and bubbly. Remove the sauce pan from heat, add half the cheddar cheese, and whisk until the sauce is creamy.
5. Ladle enough sauce to thinly coat the bottom of a deep 1-1/2 quart baking dish.
6. Add a single layer of potatoes, sprinkle with more salt and pepper (if you want), then ladle more sauce—about 1/2 cup—evenly on top. Add another layer of potatoes, sprinkle them with salt and pepper, and keep repeating the layers until you finish with a last layer of sauce on top.
7. Sprinkle the top of the scalloped potatoes with the remaining shredded cheddar, and then bake it covered for 30 minutes.
8. Remove the cover and continue baking for another 20-30 minutes, or until the potatoes are tender and the cheese is bubbly and melted.
9. Let it sit for 10 minutes before serving.