Preheat oven to 350 degrees. Spray 13x9 baking dish with PAM. Place broccoli around perimeter of dish. Sprinkle breast with salt and pepper. In large skillet melt butter over medium low heat. Dredge chicken in flour and sauté 3-4 minutes per side until lightly browned. Remove chicken and place in baking dish. Add flour to butter remaining in pan and stir and cook for 2 minutes. Gradually whisk in broth, sherry and cream. Cook 4 - 5 minutes, stirring constantly until thickened. Spoon sauce over chicken. Sprinkle with cheese. Cover and bake for 20 minutes. Uncover and bake 5 - 10 minutes.