Heat oil in a large skillet (or wok) over medium-high heat.
Add chicken; cook, for 4 to 5 minutes, turning once, until golden brown. Remove from pan. Set aside.
Add onion, garlic, 1⁄2 tsp. cumin, and mustard seed to same skillet; cook over medium heat, stirring frequently, for 3 to 5 minutes, or until the onion begins to soften.
Add turmeric, remaining 1⁄2 tsp. cumin, coriander, chili powder, chickpeas, tomatoes, chicken broth, and chicken.
Bring to a boil, reduce heat to medium-low; gently boil for 10 to 15 minutes.