Preheat the oven to 375℉ (190℃)
Cook 1 pound mostaccioli pasta to al dente firmness in a pot of boiling water, with a dash of salt added. When finished, rinse under cool water and drain completely.
In a skillet on the stovetop, brown 1 pound ground Italian sausage over medium heat. Add minced garlic and cook for an additional minute. Remove from heat.
Add cooked and drained pasta to the meat, along with 1 jar Italian gravy (spaghetti sauce). Sprinkle 1 tablespoon Italian seasoning blend on top, then stir to combine.
In a large mixing bowl, combine 15 ounces ricotta cheese, 1 cups mozzarella cheese, and 1 egg. Stir to combine.
Begin layering ingredients in the 13x9 inch baking dish. Start with half of the pasta and meat sauce. Next, add all of the cheese blend and spread to cover the entire dish. Then add the remaining pasta, and finally sprinkle with ¾ cups parmesan cheese.
Cover with foil and bake for 40 minutes. Uncover and cook for an additional 5 minutes. If desired, cook for a few more minutes under the broiler to brown the top. Serve with fresh basil for garnish!