Preheat oven to 350 degrees F.
In a large bowl, toss together the noodles, soup, broth, and sherry. Add the chicken, 2 cups of the cheese, the almonds, pimento, mushrooms, and salt and pepper, to taste, and toss gently to combine. Transfer the mixture to a greased 13 by 9 by 2-inch casserole and top with the remaining cup of cheese.
Bake for 30 minutes, or until bubbly.