Heat the oil in a wok or large heavy frying pan over high heat. Cook the chicken then add the onions and fry until translucent, 3-4 minutes. Add any hard veggies and cook for 3-4 minutes then add any soft veggies and cook for another 2-3 minutes. Fry until the veggies are soft but still have some crispiness to their bite. Add the seasonings. Add the cooked quinoa and stir to combine. Heat through and add more soy sauce or sesame oil according to taste. Serve immediately.