Potato Spinach Casserole
["6 to 8 large potatoes, cooked, peeled and mashed", "1 c. (8 oz.) sour cream", "1 tsp. salt", "1/4 tsp. pepper", "2 Tbsp. chopped onions", "1/4 c. margarine", "1 pkg. frozen, chopped spinach, thawed and well drained", "1 c. (4 oz.) shredded Cheddar cheese"]
["In a large bowl, combine all ingredients, except cheese. Spoon in greased 2-quart casserole.", "Bake, uncovered, at 400\u00b0 for 15 minutes. Top with cheese and bake 5 minutes longer.", "Serves 6."]
["potatoes", "sour cream", "salt", "pepper", "onions", "margarine", "frozen", "Cheddar cheese"]