Sour Cream Chicken and Noodle Casserole

3 c. cooked, diced chicken
1 (8 oz.) bag noodles
1 sm. can mushrooms
2 cans cream of chicken soup
1 (16 oz.) sour cream
8 oz. Swiss cheese

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 for 45 minutes.