Chicken, Broccoli and Mushroom Pie

Cheese Crust
1 cup lightly packed shredded sharp Cheddar cheese
3/4 cup flour
1/2 teaspoon salt
1/4 teaspoon dry mustard
1/4 cup butter, melted

Filling
1 (6 ounce) boneless skinless chicken breast
Salt
Ground black pepper
1 tablespoon butter
1 medium onion, chopped (1/2 cup)
1/4 pound fresh mushrooms, sliced (about 1 cup)
2 tablespoons flour
1 cup whipping cream
Pinch ground nutmeg
2 cups chopped, cooked broccoli
3 eggs, lightly beaten
1/4 cup freshly grated Romano cheese
1 cup lightly packed shredded Swiss cheese (4 ounces)

For crust Using pastry blender, combine cheese, flour, salt, dry mustard and melted butter. Press dough evenly into bottom and up sides of a 10 inch pie plate.

For filling: Sprinkle chicken breast lightly with salt and pepper. Bake in a 375 degree oven for 25 minutes or until done. Allow to cool. Cut into cubes; set aside. (You should have about 1 1/4 cups cubed chicken.)

Melt butter in a skillet. Over medium heat, saut