Cook the ziti pasta according to package instructions.
In a skillet, cook the ground turkey, onion, and garlic until the turkey is browned and the vegetables are softened.
Add the tomato sauce, diced tomatoes, Italian seasoning, salt, and pepper. Stir to combine.
Drain the cooked ziti and add it to the skillet with the meat sauce. Stir to coat the pasta.
Transfer the ziti mixture to a 9x13 baking dish and top with shredded mozzarella cheese.
Bake at 375°F for 20-25 minutes, or until the cheese is melted and bubbly.
