Marinate chicken with the ingredients given for 2 hours.
Mix couscous with all ingredients in a bowl. Pour over hot water, cover and cook for 15 mins till all water is absorbed. Set aside.
Heat butter in a pan, add garlic and stir fry for a min,
Add in mushrooms and mix well.
Season with salt and pepper. Cook till brown and set aside.
Now in the same pan, place chicken and cook for 5 to 6 mins on each side. Add little water and cook covered for 10 mins on low heat.
Serve over cous cous.