These caprese stuffed portobello mushrooms are a delicious and innovative way to enjoy the classic Italian flavors of tomatoes, mozzarella, and basil. The portobello mushrooms are stuffed with a mixture of diced tomatoes, fresh mozzarella cheese, and chopped basil, then baked until the cheese is melted and bubbly. The result is a flavorful and satisfying vegetarian dish that can be served as an appetizer or a main course.