Dump the cherry pie filling and undrained can of crushed pineapple into the baking dish. With a large spoon mix together the cherry pie filling and crushed pineapple until completely combined.
Open the box of Red Velvet cake mix and dump the cake mix into the 9 x 13-inch pan on top of the cherries and pineapple. Using the back of a large wooden spoon very carefully spread the dry cake mix over the cherry and pineapple in the baking dish.
Pour the melted butter over the top of the dry cake mix. Place the baking pan in the preheated oven and bake for 40 to 45 minutes. Carefully remove the hot baking pan from the oven and allow the dump cake to cool slightly before serving.
Serve the warm Red Velvet Dump Cake with a dollop of whipped cream or a scoop of vanilla ice cream. When you need a quick and easy dessert recipe this is the cake recipe to make.