The food processor makes chopping mushrooms and spinach a breeze for this flavorful casserole. Sauté the chopped mushrooms and spinach with garlic and onions, mix them with a creamy sauce, and bake it in the oven until the top is golden and the casserole is bubbling. This vegetarian dish is rich in umami flavors and packed with nutrients, making it a great option for a comforting weeknight dinner.
