Classic Scalloped Potatoes (Au Gratin Potatoes)
Cheesy, creamy, oniony potatoes that bake until they sizzle. Truly the perfect side dish to any meat and so simple to throw together!
Ingredients
- 5 large russet potatoes peeled and cut into thin rounds, about 1/4 inch thick
- 1 medium white onion, diced
- salt and pepper
- 3 tbsp butter
- 3 tbsp flour
- 1/2 tsp salt
- 2 cups milk
- 1 1/2 cups shredded cheddar cheese
Instructions
- Preheat oven to 400°. Butter a medium sized casserole dish.
- Place half of the potato slices in the bottom of the dish and top with the diced onion. Add remaining potatoes. Sprinkle the top with salt and pepper.
- In a medium saucepan over medium heat, melt the butter. Once melted, add the 3 tbsp flour. Use a whisk and stir the whole time until it turns a light amber brown color. About 2 minutes. Then pour in the milk. Stir until thickened, about 4 minutes. Next add in the cheddar cheese and stir until completely melted. About a minute.
- Pour the cheese sauce over the potatoes, sprinkle the top with a bit more salt and pepper. Cover with foil and bake for 1 hour and 30 minutes.