Preheat your oven to 375°F (190°C).
Slice the zucchinis in half lengthwise and scoop out the seeds.
Drizzle olive oil over the zucchini halves and season with salt and pepper.
Place the zucchini boats on a baking sheet and bake for 10 minutes.
In a skillet, heat olive oil, add onion and garlic, and sauté until translucent.
Stir in bell pepper and cherry tomatoes; cook for another 5 minutes.
Mix in the cooked quinoa and Italian seasoning; season to taste.
Remove zucchini from the oven and fill each boat with the quinoa mixture.
Top with shredded cheese and bake for an additional 15-20 minutes.
Serve warm and enjoy!