Preheat your oven to 375°F (190°C).
In a large bowl, combine the vegan ground turkey, breadcrumbs, nutritional yeast, flax egg, onion powder, garlic powder, salt, pepper, and chopped parsley. Mix until well combined.
Shape the mixture into meatballs, about 1 inch in diameter.
Heat olive oil in a large oven-safe skillet over medium heat. Add chopped onion and sauté until translucent. Add minced garlic and cook for another 1-2 minutes.
Place the meatballs in the skillet and brown on all sides, about 5 minutes.
Pour in the crushed tomatoes and sprinkle dried oregano, dried basil, salt, and pepper over the meatballs. Stir gently to coat the meatballs in the sauce.
Sprinkle vegan mozzarella cheese over the top of the meatballs.
Transfer the skillet to the preheated oven and bake for 15-20 minutes or until the cheese is melted and bubbly.
Garnish with fresh basil before serving.
Serve the cheesy turkey meatballs over pasta, rice, or your favorite grains