Boneless chicken thighs become tender and succulent after marinating in a simple balsamic vinaigrette, and roasting them with red onions and cranberries creates the most delicious savory, sweet-tart flavor combination. Even better, once the chicken has marinated, it comes together in about 30 minutes. Plan ahead: To get dinner on the table quickly, marinate the chicken the night before so it will be ready to go the next day.