Sour Cream Chicken Casserole

3 cups cooked, diced chicken
1 (8 ounce) bag noodles
1 small can mushrooms, drained
2 cans cream of chicken soup
1 (16 ounce) container sour cream
8 ounces Swiss cheese slices

Cook and drain noodles. Combine all ingredients except Swiss cheese. Place in 9 x 13-inch pan; top with Swiss cheese. Bake at 350 degrees F for 45 minutes.