Creamy Mustard Chicken with Couscous

Preheat oven to 400°F. Season chicken with salt and pepper, then dredge in flour, tapping off excess. Heat oil in a large oven-proof skillet over medium-high. Add chicken and cook, turning occasionally, until browned, 5 to 7 minutes. Transfer to a plate.

Discard all but 1 tablespoon fat from skillet; reduce heat to medium. Add leeks and cook until soft, about 3 minutes. Add wine and cook, scraping up browned bits, until liquid evaporates, 3 minutes. Stir in broth, mustard, and thyme; bring to a boil. Return chicken and any juices to skillet in a single layer. Roast in oven until chicken is cooked through, 15 to 17 minutes.

Transfer chicken to a plate. Bring sauce to a simmer over medium heat; stir in cream. Serve chicken and sauce with couscous and salad.