Honey-Mustard Chicken with Plums

Heat oven to 450 °F. Have a rimmed baking sheet ready. Cut four 12-in. squares of heavy-duty foil. Toss all ingredients, plus 1 ⁄4 tsp each salt and pepper, in a medium bowl. For each packet: Put a quarter of chicken mixture in middle of foil. Fold foil over to form a triangle, then fold edges over twice; press to seal. Place on baking sheet. Bake 13 minutes or until chicken is cooked through and plums are soft. Garnish with sliced scallions. Good served with toasted pine-nut couscous and a steamed vegetable.