Combine ground chicken, egg, Parmesan cheese, breadcrumbs, Italian seasoning, garlic powder, salt and pepper, and red pepper flakes in a large bowl and stir until fully combined.
Roll meatball mixture into 1-2" balls.
Roll meatballs in additional breadcrumbs to coat. In a large skillet, heat 2 tbsp. oil over medium heat.
Cook about half of the meatballs at a time in the skillet, for about 4-5 minutes, until browned.
Transfer meatballs to a plate.
Preheat oven to 350F and pour marinara sauce in the skillet, laying the meatballs on top.
Bake for about 20 minutes, sprinkling mozzarella cheese on in the last 5 minutes.
Top with torn basil leaves and serve with spaghetti noodles.
ENJOY!