Pineapple Upside-Down Cake
["yellow or white cake mix", "1 stick butter", "1 c. packed brown sugar", "1 (20 oz.) can pineapple slices, drained"]
["Preheat oven to 375\u00b0.", "Melt butter in 13 x 9 1/2-inch pan. Sprinkle brown sugar evenly in pan.", "Arrange pineapple slices on sugar.", "Add cake mix, mixed according to directions on box.", "Bake for 45 to 55 minutes.", "Turn upside down on platter."]
["white cake", "butter", "brown sugar", "pineapple"]