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Potato Puff Casserole

 Potato Puff Casserole
You'd never guess that leftover mashed potatoes are the main ingredient in this delightful casserole. "I've served this elegant side dish to company," writes Sharon Skildum of Maple Grove, Minnesota. "It's so moist and light it always brings compliments."
6 ServingsPrep: 25 min. Bake: 40 min.

Ingredients

  • 1 small onion, chopped
  • 2 tablespoons butter
  • 1/2 cup milk
  • 1/2 teaspoon ground mustard
  • 1/4 teaspoon salt
  • 1/8 teaspoon pepper
  • 2 cups mashed potatoes (with added milk and butter)
  • 2 eggs, separated
  • 1 cup (4 ounces) shredded cheddar cheese, optional

Directions

  • In a large skillet, saute onion in butter until tender. Stir in the
  • milk, mustard, salt and pepper; bring to a boil. Remove from the
  • heat; stir in potatoes. Stir in egg yolks until blended. Cool at
  • room temperature for 15 minutes. Stir in the cheese if desired.
  • In a small bowl, beat egg whites until soft peaks form. Fold into
  • potato mixture. Spoon into a greased 1-qt. baking dish.
  • Bake at 350° for 40-45 minutes or until puffed and lightly
  • browned. Yield: 6 servings.
Nutritional Facts: 1 serving (3/4 cup) equals 217 calories, 15 g fat (9 g saturated fat), 112 mg cholesterol, 488 mg sodium, 15 g carbohydrate, 2 g fiber, 8 g protein.