Preheat oven to 350 degrees
Melt butter over low heat in 12- inch cast iron skillet or skillet with oven- proof handle.
Remove from heat. Stir in brown sugar. Spread to cover bottom of skillet. Arrange pineapple slices and Maraschino cherries in skillet. Set aside.
combine cake mix, pudding mix, eggs, water, and oil in large mixing bowl. Beat at medium speed
with electric mixer for 2 minutes. Pour batter evenly over fruit in skillet.
Bake at 350 degrees in oven for 1 hour or until toothpick inserted in center comes out clean.
Using oven mitts to handle pan, invert onto serving plate immediately after removing the cake from the oven.