In 12-inch nonstick skillet, heat oil over medium heat. Add bell pepper, onion, garlic and salt; cook 5 minutes, stirring occasionally, until vegetables are soft. Stir in cumin; cook 1 minute. Stir in flour; cook 3 minutes. Reduce heat to low. Add broth and sour cream; cook 5 minutes, stirring frequently. Add chicken; stir to blend. Remove from heat.