1/2 cup chopped onion 2 stalks celery, chopped 1 carrot, diced 1/4 cup butter 1 1/2 tablespoons all-purpose flour 1 tablespoon curry powder 4 cups chicken broth 1 Granny Smith apple cored and chopped, with the peel on 1/2 cup, cooked white rice 1 cup cooked, diced chicken 1/2 teaspoon salt 1/4 teaspoon black pepper 1/8 teaspoon dried thyme 1/2 cup heavy cream