ungreased 13x9-inch baking dish, arrange in layers; a third of the tomato sauce, half the macaroni, a third of the Cheddar cheese and half the spinach mixture.~ 9. Repeat layering; spread the remaining sauce on the spinach layer and spinkle the remaining cheese around the edges of the casserole.~ 10. Cover with foil and bake in preheated 400'F. oven 25 minutes.~ 11. Uncover and bake 5 minutes longer, or until mixture is hot and bubbly and cheese is melted.~