Heat oven to 450°. Coat a roasting pan with nonstick cooking spray.
In a medium bowl, whisk soy sauce, honey, orange juice, ketchup and hot sauce. Set aside half for basting, half for serving.
Place chicken, skinned-side up, in pan. Brush generously with soy mixture for basting. Roast at 450° for 40 minutes, brushing every 10 minutes with sauce. Remove from oven when internal temperature registers 160° on an instant-read thermometer.
Combine chicken broth and onion flakes in a saucepan. Bring to a simmer; stir in couscous, cover and remove from heat. Let stand 5 minutes. Fluff with a fork.
Serve the chicken with the reserved sauce, couscous and edamame.