Remove gills from the undersides of mushrooms using a spoon; discard gills. Place caps, smooth side up, on baking sheet coated with cooking spray; broil 2 minutes. Turn caps over; broil 2 minutes.
Combine ricotta, salt, garlic powder, and rosemary, stirring well. Spread 2 tablespoons cheese mixture in each cap. Spoon 3 tablespoons pasta sauce over cheese mixture in each serving. Divide beans evenly among caps; sprinkle each serving with 2 tablespoons mozzarella. Broil 3 minutes or until cheese melts.