How to Make It
Preheat oven to 350°F. Grease a 2-liter glass baking dish with butter.
Drain and discard the juice from the can of pineapple tidbits. Place pineapple pieces, cherry pie filling, and vanilla extract in a bowl; mix together. Pour mixture into prepared baking dish.
Sprinkle the surface of the filling evenly with the yellow cake mix. In the microwave, melt butter in a separate bowl and pour it evenly over the cake mix. Use a spoon to spread the butter across the mix. Transfer baking dish to the middle rack of the oven.
Bake until the top is golden brown in spots and the filling is bubbling, about 45 minutes. Allow to cool before garnishing with whipped cream.
Consider adding sliced almonds or chopped pecans to the cake mix sprinkled overtop the fruit for a crunchy and nutty component.