Preheat oven to 400°F and line a baking sheet with parchment paper.
In a medium bowl, combine ground chicken, egg, almond flour, nutritional yeast, garlic powder, oregano, salt, and pepper.
Gently mix by hand until just combined, then roll into 1.5-inch balls and place on the baking sheet.
Bake for 15-18 minutes until the meatballs are cooked through and golden on the outside.
While meatballs bake, heat the marinara sauce in a small skillet over medium-low heat.
In a separate pan, sauté zucchini noodles with olive oil for 2-3 minutes until just tender.
Toss the baked meatballs into the warm marinara sauce to coat thoroughly.
Serve the saucy meatballs over the zucchini noodles and garnish with chopped fresh basil.