Preheat the oven to 375°F (190°C).
Cut the zucchinis in half lengthwise and scoop out the center using a spoon to create boats. Reserve the scooped-out zucchini flesh.
In a skillet, heat the olive oil over medium heat. Add the ground turkey and cook until browned, about 5-7 minutes.
Stir in the reserved zucchini flesh, cooked quinoa, marinara sauce, Italian seasoning, garlic powder, onion powder, salt, and pepper. Cook for an additional 3-4 minutes until heated through.
Spoon the turkey mixture evenly into the zucchini boats.
Top each stuffed zucchini with shredded mozzarella cheese.
Place the zucchini boats on a baking sheet and bake for 20-25 minutes, or until the zucchinis are tender and the cheese is bubbly and golden.
Remove from the oven and let cool for a few minutes. Garnish with fresh basil if desired before serving.