In a large saucepan coated with cooking spray, cook chicken in 1 teaspoon oil for 4-5 minutes or until no longer pink. Remove chicken and set aside.
In the same saucepan, saute the onion, carrot, celery and green pepper in remaining oil for 4 minutes. Add apple; cook 2 minutes longer. Combine flour and salt. Sprinkle over vegetable mixture; cook and stir for 1 minute. Gradually stir in broth and tomato paste. Bring to a boil; cook and stir 1-2 minutes longer or until slightly thickened.
Stir in the curry, ginger and pepper flakes. Return chicken to saucepan and bring to a boil. Reduce heat; simmer, uncovered, for 8-10 minutes or until vegetables are tender. Sprinkle with parsley.