01 - Preheat oven to 375°F. Grease a 9x13-inch baking dish.
02 - Boil salted water and cook ziti until just al dente, approximately 8 minutes. Drain thoroughly.
03 - In a large bowl, blend ricotta, 1 cup mozzarella, 1/2 cup Parmesan, egg, basil, oregano, salt, and pepper until smooth.
04 - Add drained pasta to the cheese mixture and toss until evenly coated.
05 - Spread 1 cup marinara sauce evenly across the bottom of the prepared baking dish.
06 - Place half of the pasta mixture over the sauce layer.
07 - Top pasta with 1 1/2 cups marinara sauce and sprinkle with 1/2 cup mozzarella cheese.
08 - Add remaining pasta mixture, then cover with remaining marinara sauce.
09 - Sprinkle remaining mozzarella and Parmesan cheeses evenly over the top.
10 - Cover dish with foil and bake for 25 minutes.
11 - Remove foil and continue baking for 15 minutes until cheese is golden and bubbly.
12 - Allow to stand for 10 minutes before serving. Garnish with extra basil if desired.