In a large mixing bowl, combine ground chicken, breadcrumbs, beaten egg, minced garlic, chopped parsley, salt, and black pepper. Mix gently and form into golf ball-sized meatballs.
Place meatballs on a baking sheet lined with parchment paper and bake for 20-25 minutes until golden brown and cooked through.
While meatballs are baking, bring a large pot of salted water to a boil and cook spaghetti until al dente. Reserve ½ cup of pasta water, then drain.
In a skillet, heat olive oil over medium heat, sauté minced garlic for 1 minute, then add tomato sauce and simmer for 5 minutes.
Add baked meatballs to the sauce and let simmer for an additional 5-10 minutes.
Combine cooked spaghetti with the sauce and meatballs, tossing gently to coat.
Serve immediately, garnished with additional parsley or cheese if desired.
Notes
Consider adding vegetables to the meatball mixture for extra nutrition.