These ratatouille stuffed portobello mushrooms are a hearty and flavorful vegetarian dish. With the help of a food processor, you can easily chop the vegetables and mix them with herbs, breadcrumbs, and cheese to create a delicious stuffing. Fill the portobello mushroom caps with the mixture and bake until the mushrooms are tender and the filling is golden brown. It's a satisfying main course that can be served with a side salad.