In a large bowl, whisk together egg product, milk, snipped or dried dill, salt, and black pepper until well mixed. Whisk in flour, making sure it is completely combined. Pour over vegetables in baking dish. Bake, uncovered, about 35 minutes or until slightly puffed and top shakes set. Sprinkle with remaining mozzarella cheese and Parmesan cheese. Let stand for 10 minutes before serving. If desired, garnish individual servings with dill sprigs.