Cook pasta shells according to package directions for al dente. Drain & set aside.
In a large saucepan, scramble-fry ground turkey with spices until no longer pink.
Preheat oven to 350 F.
In a large bowl, combine mozzarella cheese, turkey, stuffing & green onions. In a small bowl, Stir sweet potatoes with chili powder.
Fill each pasta shell with 2 Tbsp stuffing mixture & 2 tsp sweet potato mixture. Combine 1 cup of gravy with any remaining filling & spread on the bottom of a 13″ x 9″ baking dish. Place filled shells overtop, drizzle with remaining gravy & sprinkle with Parmesan cheese.
Bake, covered for 15-20 minutes or until heated through. Serve with cranberry sauce if you wish.