Cheesy Mashed Potatoes
["8 servings instant mashed potatoes", "1/2 c. butter or margarine, softened", "2 pkg. (3 oz. each) cream cheese, softened", "1/2 c. Parmesan cheese, grated", "1/2 c. Cheddar cheese, shredded", "1/4 c. scallions, chopped"]
["Prepare mashed potatoes according to package directions, omitting butter.", "Turn into casserole.", "Add butter and cheese and beat until well blended.", "Add scallions and mix well.", "Refrigerate for several hours for flavors to blend.", "If desired, sprinkle Cheddar cheese on top before baking.", "Bake at 350\u00b0 for 1 hour.", "If casserole is not refrigerated, bake for only 30 minutes.", "Serves 8 to 12."]
["potatoes", "butter", "cream cheese", "Parmesan cheese", "Cheddar cheese", "scallions"]