Chicken in Garlic Cream

1 (5-pound) roasting chicken
1/2 pound fresh sliced mushrooms
2 tablespoons butter or margarine
1/2 cup dry sherry

Garlic Cream Sauce
4 tablespoons butter
2 onions, chopped fine
3 tablespoons flour
2 cups no fat chicken broth
2 cloves garlic (minced and crushed)
4 egg yolks
1 cup heavy cream
Cooked noodles for six

Simmer chicken until tender, 1 1/2 to 2 hours. Strain broth; skim off fat. Skin and bone chicken, cut into large pieces.

Saut