03Preheat oven to 375°F. Place chicken on rack in roasting pan. Roast chicken 20 minutes; add 1 cup broth to roasting pan. Roast chicken 20 minutes longer; add 1 cup broth to roasting pan. Roast chicken until thermometer inserted into thickest part of thigh registers 170°F, about 45 minutes. Let chicken rest 10 minutes.
04Meanwhile, pour juices from roasting pan into 2-cup measuring cup. Add more broth if needed to equal 2 cups. Simmer butter in medium saucepan over medium heat until beginning to brown, about 2 minutes. Add flour; stir 1 minute. Whisk in broth mixture; bring to boil. Stir in mustard and 1 teaspoon thyme leaves. Season sauce with salt and pepper.
05Slice chicken. Divide chicken among plates. Drizzle with sauce and serve Green Salad with Olives alongside.