Smothered Chicken with Creamy Mushroom Gravy

Name: Smothered Chicken with Creamy Mushroom Gravy
Yield: Makes 4 Servings
Ingredients: 1/3 cup all purpose flour; 1 1/2 teaspoons dried thyme; 1/2 teaspoon ground allspice; 4 large skinless boneless chicken breast halves; 1/4 cup (1/2 stick) butter; 1 pound mushrooms, thinly sliced; 1 small onion, chopped; 1 cup whipping cream; 1 cup canned low-salt chicken broth