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Potato Puff Casserole

By: Taste of Home's Fast Family Favorites

"You'd never guess leftover mashed potatoes are the main ingredient in this delightful casserole that's good enough for company."

Rate/Review | Read Reviews (6)

Servings (Help)

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Original Recipe Yield 6 servings

Ingredients

1 small onion, chopped
2 tablespoons butter or margarine
1/2 cup milk
1/2 teaspoon ground mustard
1/4 teaspoon salt
1/8 teaspoon pepper
2 cups mashed potatoes (prepared with milk and butter)
2 eggs, separated
1 cup shredded Cheddar cheese (optional)

Directions

In a skillet, saute onion in butter until tender. Stir in milk, mustard, salt and pepper; bring to a boil. Remove from the heat; stir in potatoes and mix well. Stir in egg yolks until smooth. Cool at room temperature for 15 minutes. Stir in the cheese if desired.
In a small mixing bowl, beat egg whites until soft peaks form. Fold into the potato mixture. Spoon into a greased 1-qt. baking dish.
Bake at 350 degrees for 40-45 minutes or until puffed and lightly browned. Yield: 6 servings.