1 lb. ground beef
1 (1 1/4 oz.) pkg. taco seasoning
1 (15 oz.) can tomato sauce
3 c. cooked macaroni
1 c. shredded cheddar cheese
1/4 c. Parmesan cheese
1 (8 oz.) sour cream

Brown beef; drain, stir in seasoning mix, tomato sauce, bring to a boil and remove from heat. Combine cooked add drained macaroni; 1/2 cup cheddar cheese and sour cream. Place on bottom of 13"x10" dish. Top with meat mixture and remaining cheese. Sprinkle Parmesan cheese on top and bake at 350 degrees for 30 minutes.