1 lb. Ziti pasta
1 onion, chopped
1 lb. ground beef
2 (26 oz.) jars spaghetti sauce
6 oz. provolone cheese, sliced
1 1/2 c. sour cream
6 oz. mozzarella cheese, shredded
2 T. Parmesan cheese
1.  Cook pasta.  Drain.
2.  Brown ground beef & onion.  Add spaghetti sauce.  Simmer 15 minutes.
3.  350 degrees.  Spray or butter pan (makes a HUGE 9 x 13 - so it is better to use a larger pan if you have one).   Layer.
1/2 ziti
provolone cheese
sour cream
1/2 sauce
remaining ziti
mozzarella cheese
remaining sauce
top with grated parmesan
Bake 30 minutes or until cheese is melted.  SO YUMMY!!!!
