1Make Mustard and Maple Marinade: Place marinade ingredients in medium bowl and whisk to combine. Add chicken and turn to coat. Set aside.
2Place sweet potato slices on microwave safe plate. Season with salt and pepper and pour over stock. Cover plate with vented lid or plastic wrap and place on turntable. Press MICROWAVE and set 100% for 5 minutes. Press START to begin cooking.
3Arrange chicken slices in a single layer over sweet potatoes and place broccolini next to chicken. Cover and place back on turntable. Press MICROWAVE and set 100% for 4 minutes. Press START to begin cooking.