Baked Ziti with Crumbled Sausage and Ricotta

This recipe will serve about 8 people, and can be doubled or tripled easily.
0 Position an oven rack in the center of the oven. Preheat the oven to 425F (220C).
2 Place a 10-12-inch skillet over medium-high heat. When the pan is hot, add the olive oil and onion. Cook 2-3 minutes, stirring frequently, until the onion is soft and translucent. Add the sausage, using a spoon to crumble the meat, and cook until it's no longer pink, 5-7 minutes. Stir in the garlic, oregano and red pepper. Remove from the heat and set aside.
1 Bring a large pot of water to a boil and season generously with salt. Add the ziti and cook for 6 minutes — or half the amount of time directed on the package. Be sure not to overcook the pasta, since it will continue to cook in the oven. Drain, then dump it back into the pot and combine with the cooked sausage.
Assemble the baked ziti
8 Put the ricotta in a medium bowl with the chopped parsley or basil. Stir together until smooth and creamy.
3 Spread 1½ cups of marinara sauce over the bottom of a 9x13-inch baking dish (4 quart capacity). Sprinkle ½ cup of the mozzarella evenly over the sauce. Add half of the ziti and sausage mixture, spreading to the edge of the dish. Spoon ½ cup of the ricotta mixture in even dollops over the pasta. Sprinkle with ½ cup of the mozzarella and  ¼ cup of the grated Parmesan or Roman cheese. Add another 1½ cups of marinara sauce, spreading it to the edges of the dish.
5 Add the remaining ziti to the dish. Top evenly with the remaining ricotta and ¼ cup Parmesan. Pour the remaining ½ cup of marinara over the pasta. Distribute the remaining 1 cup of mozzarella over the top.
6 Put the baking dish on a rimmed baking sheet (this helps to catch any overflow of bubbling sauce or cheese). Bake 25 minutes, or until the edges of the ziti are crisp and the cheese is melted and golden.
7 Cool the baked ziti for about 10 minutes before serving.