Bring the water to a boil in a small saucepan; gradually stir in couscous. Remove mixture from heat; cover and let stand 5 minutes or until done. Fluff couscous with a fork.
Heat the olive oil in a large nonstick skillet over medium-high heat. Add the chicken, chopped onion, and minced garlic, and cook 3 minutes, stirring mixture frequently.
Add broth and remaining ingredients to chicken mixture in pan; bring to a boil. Reduce heat, and simmer mixture, uncovered, 15 minutes. Serve with couscous.