If you’re using chicken tenderloins, which are smaller cuts of chicken breast meat, then you shouldn’t need to bake it after simmering. The reason is because the cuts of chicken are small, they cook quickly and evenly. If you’re modifying this recipe for larger pieces of boneless skinless chicken breast, then you will probably need to bake chicken in the oven (after simmering ~5-10 minutes) so it cooks throughout.