Preheat your oven to 375°F (190°C). Prepare a 9x13 inch baking dish by lightly greasing it with cooking spray or a tablespoon of olive oil.
In a large skillet, heat the olive oil over medium heat. Once hot, add the diced onion and minced garlic. Sauté for about 3-4 minutes, or until the onion turns translucent and fragrant.
Add the ground turkey to the skillet, breaking it up with a wooden spoon. Cook for 5-7 minutes, stirring frequently, until the turkey is browned and no longer pink.
Incorporate the sliced zucchinis, halved cherry tomatoes, dried oregano, dried basil, salt, and pepper into the skillet. Sauté for another 5 minutes, stirring occasionally, until the zucchinis are slightly tender.
In a large mixing bowl, combine the mixture from the skillet with the cooked quinoa. Mix thoroughly until all ingredients are well-combined.
Transfer the turkey and vegetable mixture into the prepared baking dish, spreading it evenly to ensure every bite is flavorful.
Generously sprinkle the shredded mozzarella and grated parmesan cheese over the top of the casserole for that delicious cheesy finish.
Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the cheese is melted, bubbly, and lightly golden brown on top.
Once out of the oven, allow the casserole to cool for about 5 minutes before serving to set slightly and enhance the flavors.
Notes
Serve warm directly from the baking dish and garnish with fresh basil or parsley.