Stuffed Portobello Delight

Ingredients

• 1/2 cup parmesan cheese, grated
• 1/3 cup red bell pepper, finely chopped
• 1/2 teaspoon kosher salt, divided
• 1/2 cup part skim mozzarella cheese, shredded
• 1 teaspoon olive oil
• 3/4 cup part skim ricotta cheese
• 1/2 cup marinara sauce
• 3 cloves garlic, minced
• 1 large egg
• 2 tablespoons fresh basil, chopped
• 2 cups baby spinach, chopped
• 4 large portobella mushroom caps, gills and stems removed
• 1/3 cup onion, finely chopped