In each of 4 (2-cup) ovenproof ramekins or individual baking dishes, place 2 tablespoons pizza sauce. Sprinkle 1/2 cup cheese over sauce in each ramekin. Arrange 4 slices pepperoni, overlapping slightly, on top of cheese in each ramekin. Spread 1 tablespoon of pizza sauce over pepperoni in each. Fill each with another 1/2 cup cheese.