Step 1

Preheat oven to 375 F and lightly grease a 9 inch square dish.

Step 2

Heat a large nonstick skillet over medium high heat and add in the olive oil. Add the onion and cook for 3-4 minutes until softened, then add in the garlic and oregano. Saute for 30 seconds.

Step 3

Add in the bell peppers and mushrooms and cook until softened and lightly browned.

Step 4

Transfer the cooked vegetables to a large bowl and add in the olives, quinoa, sauce, 1 cup of mozzarella, parmesan and salt and pepper, to taste.

Step 5

Pack into the baking dish and top with the remaining 1/2 cup mozzarella cheese. Bake for 20-25 minutes until golden brown around the edges and bubbling. Top with basil leaves, if desired, as garnish.