Using small ramekins a little bit bigger then your donuts, butter or non stick spray the insides. Sprinkle 1-2 tablespoons of brown sugar and 1 tablespoon of butter on the bottom. Add a pineapple ring and place 2 donuts on top press down with a bottom of drinking glass to get the donuts to stick together in the ramekins.
Bake at 350 degrees until brown sugar is melted and bubbly 15-20 minutes. Invert while hot on a plate.
Serve when cooled with whipped cream or vanilla ice cream.