These stuffed peppers are a healthy and flavorful meal that are perfect for a vegetarian dinner. To make the filling, sauté zucchini, onion, and garlic in a pan with olive oil and seasonings. Add cooked quinoa and stir to combine. Stuff the mixture into bell peppers and bake in the oven until the peppers are tender and the filling is heated through. This dish is a great way to get in some extra vegetables and plant-based protein.