A rich, creamy sauce made without dairy—using dairy-free sour cream or cream cheese—combined with white wine, mustard, caramelized onions, and mushrooms transforms simple chicken into a comforting, elegant dinner. Ready in 30 minutes or less, this Gluten & Dairy Free Creamy Mustard Chicken is an allergy-friendly adaptation of Ina Garten’s classic, modified to be gluten-free, dairy-free, egg-free, peanut- and tree nut-free, with a soy-free option available.