Heat the oven to 350 degrees.
Add the butter to a saucepan over medium heat on the stove.
Mix the brown sugar into the melted butter until completely dissolved.
Place a spoonful of this mixture into 6 sections of a well greased muffin tin.
Put a pineapple ring into each section of the muffin tin, and add a cherry to the middle of each pineapple ring.
Blend together the ingredients for the cake mix in a mixing bowl. Substitute the water needed for the pineapple juice reserved from the can.
Spread the mixture into the filled muffin tins and bake for 30 minutes.
Cool for 10-15 minutes, and then lift the mini cakes out of the muffin tin.
Allow to cool before serving.