Overnight Mashed Potato Casserole
["3 lb. (about 12 medium) potatoes, peeled, cooked (hot)", "1 (8 oz.) pkg. cream cheese (at room temperature)", "1/4 c. butter or margarine", "1/2 c. sour cream", "1/2 c. milk", "2 eggs, lightly beaten", "1/4 c. onions, finely chopped (optional)", "1 tsp. salt", "dash of pepper"]
["Mash hot potatoes in large mixer bowl.", "Add cream cheese in small pieces and then butter.", "Beat well until cheese and butter are melted and completely mixed.", "Mix the eggs, milk and onions and add to the potato mixture along with the salt and pepper. Beat well until light and fluffy.", "Place in greased 9-inch round casserole and refrigerate overnight.", "Bake in preheated oven at 350\u00b0 for 45 minutes until lightly browned on top.", "Makes 8 to 12 servings.", "(This is a great holiday casserole.)"]
["potatoes", "cream cheese", "butter", "sour cream", "milk", "eggs", "onions", "salt", "pepper"]