Pineapple Upside-Down Cake

1 (16 ounce) box pound cake mix
1/4 cup butter or margarine
1/2 cup brown sugar
1 (15 1/2 ounce) can pineapple chunks, juice reserved
6 to 8 maraschino cherries, halved

Mix cake mix according to package directions, using pineapple juice for part of the liquid. Melt butter in lightly greased bake pan. Stir in brown sugar and spread evenly over the bottom of the pan. Add pineapples and cherries. Pour in cake batter. Cover bake pan. Place into crockpot. Bake in covered crockpot on HIGH for 2 1/2 to 3 1/2 hours. Remove and invert immediately onto a large platter.