Cook macaroni as directed on package; drain. Cook and stir beef and onion in
10-inch skillet until beef is light brown; drain. Stir in tomato sauce and salt.
Spread half the macaroni in a greased 8-inch square baking dish; cover with beef
Mix 1/2 cup of the cheese and cinnamon. Sprinkle over beef mixture. Cover
with remaining macaroni.
Cook and stir milk and butter in 2-quart saucepan until butter is melted. Stir
at least half the milk mixture gradually into beaten eggs. Blend into milk mixture
in saucepan; pour over macaroni. Sprinkle with remaining 1 cup cheese.
Bake uncovered at 325 degrees F until brown and center is set, about 50 minutes.
Sprinkle with nutmeg. Garnish with parsley if desired.