Preheat oven to 375.
Rinse zucchini and slice in half lengthwise.Scoop out "pulp," give it a rough chop and set aside.
Pour 3/4 cup marinara sauce into rectangle baking dish. Place zucchini halves in pan.
Heat oil in large skillet over med/high heat. Add onion and cook for 3/4 minutes. Add garlic and cook for another minute. Add in ground turkey and spices. Cook until meat is browned and cooked through.
Add zucchini pulp and 3/4 cup marinara sauce and simmer for about 5 minutes. Let cool until warm.
Grate cheese.
Add 1/2 cup grated cheese to the meat mixture. Fill each zucchini half with meat mixture and top with remaining cheese.
Cover with foil and bake for about 15 minutes. Remove foil and continue baking until cheese is melted and zucchini is tender.