Combine first 10 ingredients in a shallow dish or large heavy-duty zip-top plastic bag; add chicken. Cover or seal, and chill 30 minutes, turning chicken occasionally.
Remove chicken from marinade, discarding marinade.
Cook chicken in hot oil in a large skillet over high heat 4 minutes. Reduce heat to medium-low; turn, and cook 10 minutes or until done. Serve with hot cooked couscous. Garnish, if desired.