Preheat your oven to 400°F and lightly grease a small oven-safe baking dish.
Bring a pot of salted water to a boil and cook the ziti until al dente, then drain and set aside.
Heat the olive oil in a skillet over medium heat and add the ground turkey, breaking it up as it cooks.
Season the turkey with garlic powder, dried oregano, sea salt, and black pepper, cooking until browned and cooked through.
Add the baby spinach to the skillet and stir for 1-2 minutes until it is completely wilted.
Lower the heat and stir in the marinara sauce and Greek yogurt until the mixture is creamy and well combined.
Fold the cooked ziti into the sauce until every noodle is evenly coated.
Transfer the pasta mixture to the prepared baking dish and spread it out evenly.
Sprinkle the shredded mozzarella cheese over the top in an even layer.
Bake for 10-12 minutes, or until the cheese is melted and develops a bubbly golden crust.
Remove from the oven and let it sit for 2 minutes before serving hot.