recipe for stuffed mushrooms

Ingredients 20-25 large white mushrooms or cremini mushrooms 1/2 cup breadcrumbs 1/4 cup grated Parmesan cheese 2 cloves garlic, minced 2 tablespoons fresh parsley, chopped 1 tablespoon olive oil 4 ounces cream cheese, softened 1/4 teaspoon salt 1/4 teaspoon black pepper 1/4 cup shredded mozzarella cheese (optional)