Lemon-Mustard Grilled Chicken

Arrange chicken breasts skin side up, in an 11- by 8- by 2-inch glass baking dish. Whisk together all remaining ingredients except lemon wedges. Brush half the mixture over chicken. Cover chicken with wax paper and refrigerate at least 2 hours. Place chicken (still covered with wax paper) in microwave and cook on high power for 10 minutes, or until the internal temperature of chicken registers 150 degrees F on an instant-read thermometer. Prepare an outdoor grill or heat the broiler. To grill chicken: Lightly oil a grill rack and grill chicken, skin side down, 5 minutes. Flip chicken, brush with reserved lemon-mustard mixture, add lemon wedges, and grill for 5 minutes longer, or until internal temperature of chicken registers 170 degrees F on an instant-read thermometer. To broil chicken: Place chicken skin side down on a broiler pan. Broil on lowest rack in oven (so glaze doesn't burn) 5 minutes. Flip chicken, brush with reserved lemon-mustard mixture, add lemon wedges, and broil until skin is crispy, about 5 minutes longer, or until internal temperature of chicken registers 170 degrees F on instant-read thermometer.