Pineapple Upside Down Bundt Cake

Preheat oven to 350° and grease a bundt pan (generously) with cooking spray. In a medium bowl, whisk together melted butter and brown sugar, then pour mixture into bottom of bundt pan.  Place halved pineapple rings and cherries around the bottom of the pan, alternating between each.   In a large bowl, beat together cake mix, vegetable oil, pineapple juice, water, and eggs. Pour batter over pineapples and cherries. Bake until a toothpick comes out clean, about 35 minutes.  Serve warm or at room temperature, slicing cake between pineapples.