MIX mustard, marmalade, ginger and garlic.
PLACE chicken in glass dish or plastic bag. Pour 1/4 cup of the mustard mixture over chicken; turn to coat. Cover. Refrigerate at least 1 hour. Remove chicken from mustard mixture; discard mustard mixture.
GRILL or broil chicken 5 to 6 minutes on each side or until cooked through. Heat remaining mustard mixture. Serve over chicken.