Preheat oven to 375 degrees F.
Spray 9×13” baking dish with cooking spray and set aside.
In large skillet, heat olive oil over medium heat.
Add onion, bell pepper, zucchini, and summer squash.
Cook until softened, about 10 minutes, stirring frequently.
Add garlic, basil, oregano, and salt, and cook 2 more minutes.
Combine vegetables with cooked quinoa and cooked chicken, tossing to combine.
Combine with Prego Italian Sauce and stir well to combine.
Pour into prepared baking dish and top with cheese.
Bake for 15 minutes, until cheese is melted and mixture is bubbling.
Top with fresh basil and serve.