Sprinkle both sides of chicken with salt, pepper and cumin. Add oil to large saute pan over medium-high heat. Cook the chicken on each side for 4 minutes. Then remove from pan and keep warm.
In same pan, add onions and garlic. Cook for two minutes then add chilies and zucchini. Let saute for 3 minutes. Add chicken broth and coconut milk. Bring just to a boil then add chicken back to pan. Reduce heat to medium and cover. Let cook for 30 minutes.
In a saucepan over medium-high heat, add chicken broth for couscous to a boil. Once bubbling, add couscous, cover with lid and cook for 10 minutes. Remove from heat - do not remove lid until ready to serve.
Serve portion of couscous and piece of chicken with ladle of sauce over top. Sprinkle with chives, if desired.