Preheat oven to 375°. Pour 2 tablespoons olive oil in baking pan and spread evenly. Once the oven is heated, place oiled dish in oven. Wash, dry and stem mushrooms. Chop stems and combine with onion, cheese, salt, pepper and paprika. Add 1 tablespoon olive oil to this mixture and stuff mushrooms. Remove warmed pan from oven, and arrange mushrooms in pan. Bake for 10 minutes.