Mix ground turkey with minced garlic, breadcrumbs, egg, parmesan, salt, and pepper; form into 12 meatballs (about 1.5 ounces each).
Heat olive oil in a large skillet over medium-high heat and brown meatballs on all sides (about 6 minutes total); pour marinara sauce over and simmer until internal temperature reaches 160°F (about 5 minutes).
While meatballs cook, spiralize zucchini (or use a vegetable peeler to create ribbons) and place in a colander; set aside.
Toss warm zucchini noodles with 1 tablespoon olive oil and salt; divide among four bowls and top with 3 meatballs and sauce.
Serve immediately with extra parmesan if desired.