reheat a medium size sauté pan on medium-high heat.
Trim all visible fat from the chicken breast. Season both sides with salt and pepper. Spray the sauté pan with fat-free non stick cooking spray and sear both sides of the chicken. Put the sauté pan with the chicken in the oven and cook for 12-13 minutes until the internal temperature has reach 170 degrees.
Combine the remaining ingredients in a small sauce pot. Stir well until combined. Heat the sauce on low heat until warm. When the chicken is done spoon the hot mustard sauce over the chicken breast. Serve.