Preheat oven to 350 degrees and lightly grease a 13"x9" baking dish.
Brown beef in a skillet over medium heat; drain. Stir in tomato sauce and seasoning mix. Bring to a boil and remove from heat. Combine cooked macaroni, sour cream and 1/2 cup cheddar cheese in a large bowl. Add the beef mixture to the macaroni mixture and stir to combine.
Spoon macaroni mixture into the prepared pan and sprinkle with remaining 1 cup of cheddar cheese and Parmesan cheese.
Bake, uncovered at 350 degrees for 25-30 minutes, or until hot and bubbly. Sprinkle with chopped green onions for garnish.
Notes
Freezing Instructions: Prepare recipe according to directions up until baking. Freeze at this point. To eat after freezing: thaw in the refrigerator overnight and bake covered in the oven for 25-35 minutes or until hot.Source: Renae Scheiderer from Gooseberry Patch