Zesty Italian Crescent Casserole

I'm 99% sure I got this one from a Pillsbury cookbook. I adjusted the recipe a bit, though. This was really yummy!

What You'll Need:

1 lb lean ground beef

1/4 cup chopped onion

1 pkg (1.5 oz) spaghetti sauce mix

1 can tomato sauce

2 cups mozzarella

3/4 cup sour cream

1 can crescent rolls

1/3 cup grated Parmesan

2 tbsp butter, melted

How To Make It:

Heat the oven to 375 degrees. In a 10-inch skillet, cook the beef and onion over medium heat 8-10 minutes, stirring occasionally, until beef is thoroughly cooked; drain. Stir in the sauce mix and tomato sauce and heat until hot and bubbly. In a small bowl, mix the mozzarella and sour cream. Pour the hot meat mixture into an ungreased 13x9 inch glass baking dish. Spoon the cheese mixture over the meat. Separate the crescent roll dough into 2 rectangles. Place rectangles over the cheese mixture. In a small bowl, mix the Parmesan and butter; crumble evenly over the dough. Bake for 18-25 minutes until deep golden brown. Cut into squares and serve.