Preheat oven to 400℉. In a small bowl combine brown sugar and spices. Smear 1 tbsp of butter onto the bottom of each 5" round x 1" high ramekin. Sprinkle an approximate 2 tbsp brown sugar spice mix over butter. Slice bananas into approximate 1/8" slices and arrange in a concentric circle over the brown sugar, overlapping each slice just slightly. Drizzle 1 tsp rum evenly over bananas.