Cook pasta according to package directions, adding the broccoli flowerettes during the last 4 minutes of cooking. Drain. Cover and keep warm.
Meanwhile, in a 2-quart saucepan heat thawed Browned Mushroom Sauce just to boiling. Add sherry or broth; whisk until sauce is smooth. Stir in chicken; heat through. Serve over hot pasta mixture. Garnish with thyme, if desired. Makes 4 servings.