11. Preheat oven to 375°F. Generously butter a 9x13 inch baking dish.
22. Boil ziti in salted water until al dente, about 8-9 minutes. Drain and set aside.
33. Brown Italian sausage in large skillet over medium-high heat, breaking into small crumbles until fully cooked, about 7-8 minutes.
44. In large mixing bowl, combine ricotta, eggs, minced garlic, chopped basil, oregano, and red pepper flakes. Mix thoroughly.
55. Layer pasta in baking dish: spread thin layer of marinara, add half the ziti, sprinkle half the sausage, spread ricotta mixture, top with mozzarella and Parmesan.
66. Repeat layering process, ending with generous cheese topping.
77. Bake uncovered until cheese is bubbling and golden brown, approximately 25-30 minutes.
88. Let rest 10 minutes before serving to allow layers to set.