Preheat a non-stick skillet over medium heat and add olive oil.
Finely chop the garlic and onion, then sauté them in the olive oil until translucent.
In a mixing bowl, combine the lean ground turkey, egg white, sautéed garlic and onion, dried oregano, salt, and pepper. Mix until just incorporated.
Form the mixture into small meatballs, about 1 to 1.5 inches in diameter.
Place the meatballs in the skillet and cook on medium heat, turning occasionally, until they are browned on all sides and cooked through, approximately 8-10 minutes.
While the meatballs cook, use a spiralizer or a vegetable peeler to create zucchini noodles from the zucchini.
Lightly steam or sauté the zucchini noodles in a separate pan for 2-3 minutes until slightly tender but still crisp.
Heat the tomato sauce in a small pot until warm.
Plate the zucchini noodles as a base, top with the turkey meatballs, and drizzle the warm tomato sauce over the top.
Serve immediately and enjoy your nutritious, lean meal.