01 -  Preheat oven to 375°F (190°C). Cook rigatoni in a large pot of salted boiling water according to package instructions. Drain thoroughly. 
 02 -  In a skillet over medium heat, cook ground turkey until fully browned and no longer pink, breaking it up with a wooden spoon. Drain excess fat. Stir in marinara sauce and heat through. 
 03 -  In a large mixing bowl, combine drained pasta with turkey and sauce mixture. Transfer to a lightly greased baking dish and spread evenly. Scatter shredded mozzarella cheese evenly over the top. 
 04 -  Place baking dish in preheated oven. Bake for 20 to 25 minutes until cheese is melted, bubbling, and lightly golden.