Fire up the grill (or your oven to 400F).
In a bowl, mix together the ingredients for the sauce.
Season chicken breast pieces or tenders with sea salt and pepper. If desired, not required, skewer the pieces with wooden kabob sticks.
Place the chicken on the grill and cook for about 10 to 12 minutes. Then, brush or rub the chicken with the mustard sauce and cook for another 8 to 10 minutes (or until the chicken) is completely cooked and the inside is white.
Enjoy!