Preheat the oven to 350 degrees F .
Grease an 8-inch pan with cooking spray.
Drain pineapple slices; set aside.
Stir together brown sugar and melted butter in the prepared pan; spread evenly in the bottom of the pan. Place pineapple slices into brown sugar mixture. Place a cherry into the center of each pineapple slice and the center of the pan.
Beat together cake mix, cold water, and egg in a large bowl.
Pour batter evenly over pineapple and cherries in the pan.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 25 to 30 minutes.
Cool in the pan for 5 minutes. Loosen edges and turn out onto a serving platter.