Preheat oven to 375F

Cook ziti according to package directions

Drain pasta and set aside

In mixing bowl, beat egg with the wisk or fork

Add ricotta and 1/4 cup parmesan cheese

Stir until mixture is uniform

Spray casserole dish with cooking spray

Spread 1 cup of spaghetti sauce in casserole dish

Spread 1/3 of ziti on bottom of casserole dish

Spread 1/2 the ricotta mixture over the ziti

Spread 2/3 cup of mozzarella over ricotta

Sprinkle 1 tablespoon of parmesan cheese over mozzarella

Pour 1 cup of sauce over mixture

Spread 1/3 of ziti over mixture

Spread remaining ricotta mixture over ziti

Sprinkle 2/3 cup of mozzarella over ricotta

Sprinkle 1 tablespoon of parmesan cheese over mixture

Pour 1 cup of sauce over mixture

Top with remaining ingredients

Cover casserole dish with foil

Bake for 1 hour in preheated oven

Serve