Ingredients Ingredient Checklist 1 large egg 1 15- to 16-ounce container part-skim ricotta 1 5-ounce package baby spinach, coarsely chopped 3 large or 4 small portobello mushroom caps, gills removed (see Tip), halved and thinly sliced 1 small zucchini, quartered lengthwise and thinly sliced 1 28-ounce can crushed tomatoes 1 28-ounce can diced tomatoes 3 […]