Chicken-Mushroom Ragout

Ingredients

• 1 14 1/2 ounce can reduced-sodium chicken broth
• 1 tablespoon horseradish mustard
• 1/4 teaspoon pepper
• 2 sprigs fresh thyme or 1/2 teaspoon dried thyme, crushed
• 4 boneless, skinless chicken thighs, cut into bite-size pieces (12 ounces total)
• 8 ounces fresh mushrooms, halved (3 cups)
• 1 cup sliced carrots
• 1 cup sliced leeks
• 1 cup water
• 2 tablespoons cornstarch