Preheat the oven to 375°F (190°C).
Slice the zucchinis in half lengthwise and scoop out the seeds.
In a skillet over medium heat, cook the ground turkey until browned.
Add diced onions and bell peppers; sauté until softened.
Stir in diced tomatoes, garlic powder, Italian seasoning, salt, and pepper.
Fill each zucchini half with the meat mixture.
Place the filled zucchinis on a baking sheet.
Sprinkle shredded cheese on top of each boat.
Bake for 25-30 minutes until zucchinis are tender.
Garnish with fresh herbs before serving.