Cook your quinoa to package directions and chill in the fridge.
Season and bake your chicken in the oven until cooked through (at least 165 F. on a meat thermometer). Chill in the fridge. (I seasoned mine with garlic powder, onion powder, salt and pepper and used coconut oil)
Chop the cooled chicken, apples, onions and walnuts (if using) into bite-size pieces. Smaller chunks make for a more pleasant experience.
Toss everything together, season with salt and serve.
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.