This was my contribution to "Casserole, err..I mean Bake" Night. It's very hearty and freezes well!
1/2 lb ziti pasta
1 cup of chopped onion
1/2 lb ground beef
1 jar of spaghetti sauce
3 oz (about 5 slices) of provolone cheese
3/4 cup of sour cream
6 oz of shredded mozzarella cheese
1. Boil pasta until al dente. Drain and set aside.
2. Brown meat and onions in a skillet. Drain and return to skillet.
3. Add sauce and simmer for 15 minutes.
4. Layer as follows in medium casserole (I mean baking) dish; 1/2 the pasta, provolone cheese, sour cream, 1/2 the sauce mixture, remaining pasta, mozzarella cheese, and remaining sauce. Sprinkle the top with parm.
At this point you can either cover and freeze or bake at 350 degrees for 45 minutes. If you freeze, thaw completely before baking.