Cheese and Spinach Stuffed Portobellos

Name: Cheese and Spinach Stuffed Portobellos
Ingredients: 6 large portobello mushroom caps, stems removed; 1⁄4 teaspoon seasoning salt; 1⁄4 teaspoon fresh ground pepper, divided; 1 cup part-skim ricotta cheese; 1 cup finely chopped fresh spinach; 2 minced garlic cloves; 1⁄4 cup finely shredded parmesan cheese; 2 tablespoons finely chopped kalamata olives; 1 tablespoon finely minced chives (may substitute green onion); 1⁄2 teaspoon italian seasoning; 1 cup prepared marinara sauce; 1⁄2 cup shredded mozzarella cheese