To assemble lasagna, place 1/3 of sauce mixture in ungreased 13x9-inch (3-quart) glass baking dish. Cover with 3 cooked noodles. Top with half of spinach mixture, then 3 noodles and 1/3 of the sauce. Sprinkle with half of the cheese. Cover with 3 noodles. Top with remaining half of spinach mixture, remaining 3 noodles and remaining 1/3 of sauce. Spray sheet of foil with nonstick cooking spray. Cover baking dish with foil, sprayed side down.