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Potato Puff Casserole

By: Neena Marston

"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 Neena Marston of Newport, Vermont. 'It's so moist and light it always brings compliments.'"

Rate/Review | Read Reviews (7)

Prep Time:
25 Min

Cook Time:
40 Min

Ready In:
1 Hr 5 Min

Servings (Help)

US Metric Calculate

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

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 potato mixture. spoon into a greased 1-qt. baking dish. bake at 350 degrees F for 40-45 minutes or until puffed and lightly browned.