Preheat the oven to 375°F (190°C).
Slice the zucchinis in half lengthwise and scoop out the seeds.
In a bowl, combine cooked quinoa, diced tomatoes, bell peppers, onions, garlic powder, and Italian seasoning.
Season the mixture with salt and pepper to taste.
Fill each zucchini half with the quinoa mixture.
Top with shredded cheese.
Place the zucchini boats on a baking sheet.
Bake for 20-25 minutes until tender.
Remove from oven and let cool.
Garnish with fresh herbs before serving.