Preheat your oven to 375°F and lightly grease a small oven-safe baking dish.
Bring a pot of salted water to a boil and cook the whole wheat ziti until just al dente, then drain.
Heat the olive oil in a skillet over medium heat and sauté the ground turkey until it is browned and cooked through.
Stir the dried oregano, garlic powder, sea salt, and black pepper into the turkey to season.
In a small mixing bowl, whisk together the ricotta cheese and the egg white until the mixture is smooth.
In a large bowl, combine the cooked pasta, the seasoned turkey, and the marinara sauce.
Transfer half of the pasta mixture into the prepared baking dish and dollop with half of the ricotta mixture.
Add the remaining pasta mixture, top with the rest of the ricotta, and sprinkle the mozzarella cheese evenly over the top.
Bake for 20 minutes or until the cheese is melted, bubbling, and starting to turn golden brown.