Preheat the oven to 400F.
In a 9x13 rectangular dish, place the quinoa and green onions. In the meantime, place the broccoli in a large steamer and steam for 4-5 minutes. Set aside.
Mix the vegetable stock, pesto, arrowroot powder and salt in a large mixing bowl. Heat mixture until it boils.
Add the vegetable stock to the quinoa followed by the spinach or greens, parmesan cheese and 3/4 of the mozzarella cheese. Bake for 30-35 minutes. Take the quinoa casserole out of the oven and mix in the broccoli. Sprinkle the rest of the cheese over the quinoa and broccoli and place back in the oven for 5 minutes or until the cheese has melted.
I place my casserole under the broiler for 2-3 minutes to brown the top but this is just optional. Serve while still warm.