Preheat your oven to 400°F and prepare a baking sheet by lining it with parchment paper.
Using a spiralizer or vegetable peeler, create noodles from the zucchini and set aside in a bowl.
In a large mixing bowl, combine the lean ground turkey, egg white, almond flour, finely chopped small onion, minced garlic, and chopped fresh basil. Season with salt and pepper.
Mix all ingredients together until well incorporated, then form into small meatballs (approximately 6-8 meatballs).
Place the meatballs on the prepared baking sheet and bake for 18-20 minutes, or until fully cooked through.
While the meatballs cook, lightly sauté the zucchini noodles in a non-stick pan over medium heat for 2-3 minutes until just tender. Alternatively, serve them raw for extra crunch.
Warm the marinara sauce in a small saucepan.
Plate the zucchini noodles, top with turkey meatballs, and drizzle the warm marinara sauce over the dish.
Garnish with additional fresh basil if desired, and serve immediately.