In a microwave-safe bowl, melt the butter.
Whisk in the sugars.
Whisk in the egg, milk, pineapple juice, and vanilla.
Add dry ingredients and whisk to remove lumps.
Pour batter into the pan on top of the pineapples.
Bake for at 20 minutes and then loosely tent with foil to prevent browning.
Bake an additional 20-25 minutes until a toothpick comes out clean.
Cool for 10 minutes and invert onto large plate.
Let cool completely and use a HUGE spatula to transfer this on top of your cheesecake.
Chill until cold!