Three Cheese Baked Ziti

3 cups ricotta cheese (or 16 oz container)
1 Tbsp dried parsley
1 1/2 tsp salt
1 egg
10 oz pkg frozen spinach, cooked
1/3 cup grated parmesan
26 oz jar spaghetti sauce
1 lb penne rigate pasta, or ziti
16 oz shredded mozzarella

Blend together ricotta, parsley, salt, egg and spinach until smooth.  Add parmesan and blend to combine.

Spread enough sauce in a ungreased 9x13 baking dish to cover the bottom.  Arrange 1/2 of the pasta over sauce.  Spread half of the ricotta mixture over top.   cover with 1/2 of the remaining sauce and sprinkle 1/2 of the mozzarella cheese on top.  Repeat layers, ending with layer of mozzarella.  Bake at 350 for 45 minutres or till cheese is nicely browned.