Balsamic Chicken and Peppers

6 boneless skinless chicken breasts , flattened to 1/4 inch thick 1 tablespoon olive oil 3 large red bell peppers , cored,seeded and cut into 1/2 inch strips[...]

cooking spray 4 teaspoons olive oil , divided 4 boneless skinless chicken breast halves (cut into strips) salt and pepper 2 red bell peppers , thinly sliced 2[...]