Preheat oven to 350.
Cook pasta according to package instructions.
Saute beef and onion.
Add sauce and simmer for 15 minutes.
Grease a 2 quart baking dish.
Place half of the pasta in a dish, layer with Provolone and Mozzarella cheese.
Spread half of the sauce and sour cream over the cheese.
Add a layer of Parmesan cheese and basil.
Bake for 30 minutes