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Scalloped Potatoes
5 from 39 votes

Scalloped Potatoes

Scalloped Potatoes are layered thin slices of red potatoes baked in a creamy cheddar cheese sauce with sautéed onion and garlic. The rich sauce thickens with flour and milk, creating a smooth texture that surrounds tender, baked potatoes. Seasoned with salt and pepper and optionally garnished with fresh parsley, this dish offers a comforting, cheesy side that complements many meals. It's baked until the potatoes are perfectly tender, giving a satisfying balance between soft centers and lightly baked edges.

Prep Time
25 mins
Cook Time
1 hr 15 mins
Total Time
1 hr 40 mins
Servings: 7
Course: Side Dish
Cuisine: American

Ingredients

  • 3 Tbsp (26g) butter
  • 1 cup chopped yellow onion
  • 3 Tbsp (42g) all-purpose flour
  • 1 Tbsp garlic minced
  • salt freshly ground
  • black pepper freshly ground
  • 2 3/4 cups (650ml) milk whole
  • 1 1/4 cups (5 oz) cheddar cheese shredded, sharp, white
  • 2 3/4 lbs potato red
  • 1 Tbsp parsley optional, fresh, minced

Instructions

    Cup of Yum
  1. Preheat oven to 350 degrees. Spray a 13 by 9-inch baking dish with non-stick cooking spray.
  2. Melt butter in a medium saucepan over medium heat. Add onion and saute 3 minutes.
  3. Add flour and garlic and saute 1 minute.
  4. While whisking pour in milk. Bring to a light boil over medium-high heat, stirring frequently.
  5. Remove from heat. Stir in cheese. 
  6. Season with salt and pepper to taste (you'll need about 1 tsp salt). Cover pan with lid and set aside.
  7. Peel potatoes and slice into 1/6-inch slices using a mandolin. Spread half of the potatoes into an even layer in prepared baking dish (be sure each slice is separated).
  8. Pour half the sauce evenly over potatoes. Spread over remaining half of potatoes and finish by covering with remaining half of sauce.
  9. Bake in preheated oven until potatoes are tender when pierced with a toothpick or fork, about 55 - 70 minutes*.
  10. Garnish with parsley if desired and serve warm.

Notes

  • For a browned top, broil the scalloped potatoes briefly near the end of baking.
  • Use a mandoline or sharp knife to slice potatoes evenly thin for consistent cooking.
  • Adjust salt carefully; the cheddar cheese adds natural saltiness.
  • Allow the dish to rest a few minutes after baking to thicken before serving.