Preheat your oven to 400°F. In a bowl, mix the lean ground turkey with a minced garlic clove, salt, pepper, and any additional herbs of your choice.
Shape the turkey mixture into small meatballs, about the size of a golf ball. Place them on a baking sheet lined with parchment paper.
Bake the meatballs for 15-18 minutes, or until fully cooked and no longer pink in the center.
While the meatballs are baking, heat the olive oil in a saucepan over medium heat. Add the chopped onion, zucchini, and red bell pepper. Sauté until softened, about 3-4 minutes.
Pour in the tomato sauce, stir, and let the sauce simmer on low heat for about 5 minutes to allow the flavors to meld. If desired, stir in fresh basil towards the end.
Boil water in a separate pot and cook the whole wheat spaghetti according to package instructions until al dente. Drain and set aside.
Combine the spaghetti with the hearty vegetable sauce in a serving bowl. Top with the baked turkey meatballs.
Finish with a garnish of extra basil if desired, and serve warm.