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

Cheesy Scalloped Potatoes with Cheddar and Onion

Layered potatoes and onions baked in a homemade cheddar sauce, these cheesy scalloped potatoes serve 8 at 350 calories each and take 107 minutes total.
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Prep Time 15 minutes
Cook Time 1 hour 32 minutes
Total Time 1 hour 47 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 350
Ingredients Method

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
  • 1 ½ cups mild cheddar cheese shredded
  • salt and pepper to taste

Method
 

  1. Preheat oven to 400°F (205°C). Lightly spray an 8x8-inch casserole dish with nonstick cooking spray.
  2. Arrange the potatoes and onions in the prepared baking dish, staggering potato and then onion.
  3. 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.
  4. Stir in cheese all at once, and continue stirring until melted and smooth, about 30-60 seconds.
  5. Pour the cheese sauce over the potatoes, and cover the dish with aluminum foil.
  6. Bake for 85-90 minutes, or until the potatoes are tender.
  7. For a crisp topping, change the oven setting to broil after the potatoes are baked. Broil until golden brown.
  8. Season with salt and pepper to taste and serve.