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Cheesy scalloped potatoes with layered potato slices in a creamy milk sauce, topped with melted cheddar and bits of onion.

Cheesy Scalloped Potatoes with Cheddar and Onion

Print Recipe
Tender sliced potatoes and onions baked in a creamy cheddar cheese sauce until golden. This cheesy scalloped potatoes recipe serves 8 in 107 minutes.
Course Side Dish
Cuisine American
Keyword cheddar cheese, milk, onion, potatoes
Prep Time 15 minutes
Cook Time 1 hour 32 minutes
Total Time 1 hour 47 minutes
Servings 8 servings
Calories 350

Ingredients

  • 4 russet potatoes about 2 lb / 907 g, peeled and sliced into ¼-inch slices
  • 1 yellow onion sliced into rings
  • 3 tbsp unsalted butter 42 g
  • 3 tbsp all-purpose flour 23 g
  • ½ tsp kosher salt
  • 2 cups whole milk room temperature
  • 1½ cups mild cheddar cheese shredded
  • salt and pepper to taste

Instructions

  • Preheat oven to 400°F (205°C). Lightly spray an 8x8-inch casserole dish with nonstick cooking spray.
  • Arrange the potatoes and onions in the prepared baking dish, staggering potato and then onion.
  • In a medium-size saucepan, melt butter over medium heat. Mix in the flour and salt, and stir constantly with a whisk for one minute. Stir in milk. Cook until mixture has thickened.
  • Stir in cheese all at once, and continue stirring until melted and smooth, about 30-60 seconds.
  • Pour the cheese sauce over the potatoes, and cover the dish with aluminum foil.
  • Bake for 85-90 minutes, or until the potatoes are tender.
  • For a crisp topping, change the oven setting to broil after the potatoes are baked. Broil until golden brown.
  • Season with salt and pepper to taste and serve.