Brown the ground beef.

Remove from the heat and remove grease.

Stir in tomato sauce and add salt and pepper to taste.

In a bowl combine onions, cheese and sour cream.

Cook noodles according to package directions. Drain and rinse with water to stop cooking.

In a large well buttered casserole dish, spread ½ of the noodles.

Cover noodles with all the cheese mixture.

Add the rest of the noodles. Dot with butter.

Pour all meat mixture combination.

Bake at 350 degrees for 20-30 minutes uncovered.

Sprinkle with Parmesan cheese to serve.