Zesty Italian Crescent Casserole

1 lb. lean ground beef
1/4 cup chopped onion
2 cups prepared spaghetti sauce, divided
12 oz. (3 cups) shredded mozzarella or Monterey Jack cheese, divided
1 cup dairy sour cream, divided
1 can (8 oz.) Pillsbury® refrigerated crescent dinner rolls
1/3 cup grated parmesan cheese
2 tbsp. butter oe margarine, melted

Heat oven to 375º F. (185º C). In large skillet, brown ground beef and onion until beef is thoroughly cooked; drain. Stir in half of spaghetti sauce, heat thoroughly. In medium bowl, stir mozzarella cheese and sour cream. Pour hot meat mixture into ungreased 12x8" (2-qt.) baking dish or 9-1/2 or 10" deep dish pie pan. Spoon cheese mixture over meat mixture. Unroll dough over cheese mixture.
*In small bowl, combine parmesan cheese and butter; spread evenly over dough. Bake 18 - 25 minutes or until deep golden brown. Makes: 6 servings.