Pineapple Upside-Down Cake
["3 to 4 Tbsp. butter or margarine", "1/2 c. firmly packed brown sugar", "1 (7 1/2 oz.) small can pineapple slices, drained", "4 maraschino cherries", "1/3 c. chopped nuts", "1 (9 oz.) box one-layer yellow cake mix"]
["Preheat oven to 350\u00b0.", "Melt butter in bottom of 8 x 8 x 2-inch square baking pan.", "Sprinkle with brown sugar and arrange pineapple rings.", "Sprinkle with nuts."]
["butter", "brown sugar", "pineapple", "maraschino cherries", "nuts", "cake mix"]