This is a great recipe from the Pillsbury website. I have modified it slightly to suit our tastes.
¼ cup chopped onion
1 cup pasta sauce
½ cup shredded mozzarella cheese
½ cup sour cream
1 can crescent rolls
1/3 cup grated Parmesan cheese
2 Tbsp melted butter
Brown meat and onion; drain fat. Add pasta sauce and heat through.
Combine mozzarella and sour cream.
Pour meat mixture into deep dish pie pan or 11 x 7 dish. Spoon cheese mixture over meat.