portabella mushrooms recipe

#### Ingredients: - **4 large portabella mushrooms** - **2 tablespoons olive oil** - **1 small onion** (finely chopped) - **2 cloves garlic** (minced) - **1 red bell pepper** (chopped) - **1 cup spinach** (chopped) - **1/2 cup bread crumbs** - **1/2 cup grated Parmesan cheese** - **1/4 cup mozzarella cheese** (shredded) - **1/4 cup cream cheese** (softened) - **Salt and black pepper** (to taste) - **Fresh parsley** (chopped, for garnish