Pineapple Upside-Down Cake
["1 (8 oz.) can pineapple rings", "2 Tbsp. butter", "1/2 c. firmly packed brown sugar", "1 yellow cake mix"]
["Preheat oven to 350\u00b0. In a bowl, mix cake mix according to directions on package. Set aside."]
["pineapple rings", "butter", "brown sugar", "yellow cake"]