Rinse and drain quinoa. Add quinoa, water (as called for on package), and taco seasoning to a large pot and cook according to package instructions.
In a large oven-proof skillet, stir together cooked quinoa, corn, beans, tomatoes, chicken, and salsa.
Sprinkle with cheese.
Broil entire skillet on high for about 3 minutes, or until cheese is melted.
Garnish with green onion, sour cream, and avocado or guacamole.