Cook noodles according to package instructions; drain.
Brown Italian sausage until fully cooked; drain.
Combine Italian sausage with marinara sauce, diced tomatoes, 2 c. mozzarella cheese, ricotta cheese, oregano, basil, and garlic.
Combine sauce mixture with noodles and mix.
Transfer to 9x13 inch pan; top with remaining cheese.
Bake at 350° for 20-30 minutes, until cheese is completely melted.
Top with minced parsley.