1: Whisk all ingredients in a small bowl.
2: Reserve 4 tablespoons of sauce and then pour the remaining honey mustard mixture over the chicken, toss and cover with plastic wrap, letting it sit for about 30-45 minutes at room temperature.
3: Preheat the grill on medium-medium high heat and grill chicken for about 6 to 7 minutes per side or until chicken is done.
4: Pour the reserved honey-mustard sauce over chicken and let rest under foil for about 5 minutes.
5: Serve.