01 -
Boil mostaccioli according to package directions, then drain.
02 -
Brown Italian sausage in Dutch oven until no longer pink, drain excess fat.
03 -
Stir spaghetti sauce and cooked pasta into the sausage.
04 -
Combine beaten egg, ricotta, and mozzarella in a bowl.
05 -
Put half pasta mixture in baking dish, add cheese mixture, top with remaining pasta.
06 -
Cover and bake at 375°F for 40 minutes until internal temperature reaches 160°F.
07 -
Uncover, add Romano cheese on top, bake 5 more minutes until hot.