Preheat your oven to 375°F (190°C).
Slice the zucchinis in half lengthwise and scoop out the seeds.
In a skillet, heat olive oil and sauté diced onions until translucent.
Add minced garlic and cook for another minute.
Add ground turkey and cook until browned.
Mix in marinara sauce and Italian seasoning; season with salt and pepper.
Spoon the meat mixture into each zucchini boat.
Top with shredded mozzarella cheese.
Place the filled zucchinis on a baking tray and bake for 25 minutes.
Garnish with fresh parsley before serving.