This quinoa and vegetable casserole is a healthy and nutritious vegetarian dish that is packed with protein and fiber. Made with cooked quinoa, a variety of vegetables, and a creamy cheese sauce, this casserole is both delicious and satisfying. The vegetables are sautéed until tender and then mixed with the cooked quinoa. The cheese sauce is made with a combination of milk, flour, and grated cheese, and is seasoned with herbs and spices. The casserole is then baked until the cheese is melted and bubbly, creating a flavorful and comforting dish. Serve it as a main course or a side dish for a complete and balanced meal.