These Portobello Burgers are a delicious vegetarian option for burger lovers. The meaty portobello mushrooms are marinated in a flavorful mixture, then grilled to perfection. Topped with roasted red peppers, melted mozzarella cheese, and creamy avocado, these burgers are packed with flavor and texture. Serve them on a toasted bun with your favorite condiments for a satisfying and healthy meal.