Potato-Spinach Casserole
["6 to 8 large potatoes, peeled, cooked and mashed", "1 c. (8 oz.) sour cream", "2 tsp. salt", "1/4 tsp. pepper", "2 Tbsp. chopped chives or green onion tops", "1/4 c. margarine", "1 (10 oz.) 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 into a greased 2-quart casserole.", "Bake, uncovered, at 400\u00b0 for 15 minutes.", "Top with cheese and bake 5 minutes longer."]
["potatoes", "sour cream", "salt", "pepper", "chives", "margarine", "Cheddar cheese"]