Italian Crescent Casserole

I feel like I am the only one that posts on here...but I really liked this casserole and thought I would share!

2lb lean ground beef.  (I used one package from the cow)
1/2 cup chopped onion
2 cups spaghetti sauce
3 cup mozzarella or monterey jack cheese
1 (8oz) carton sour cream
1 (8oz) pkg refrigerated crescent rolls
2 tbsp butter, melted
1/2 cup grated parmesan cheese

1. Cook ground beef and onion until meat is brown; drain off fat/  Stir in spaghetti sauce; heat through.  Spread meat mixture in an ungreased 3qt baking dish.
2. Meanwhile, combine mozzarella cheese and sour cream; spoon over meat mixture in baking dish.
3. Unroll crescent rolls, but do not sperate.  On a floured surface, press dough edges together and roll out slightly to fit dish.  Place dough over cheese layer.  Brush with melted butter and sprinkle with parmesan cheese.  Bake uncovered, at 375*F for 20-25 minutes or until top is golden brown.