Heat oven to 450° F. Brush pastry crust with egg white. Prick bottom and sides; bake crust for 6 to 8 minutes. Cool. Reduce oven temperature to 375° F. Heat margarine in a skillet; sauté onion slices and mushrooms until tender. Cool. Combine with cheese, flour, and salt. Spread in bottom of shell. Combine beaten eggs and milk; pour over mixture in shell. Bake for 40 minutes or until knife inserted halfway between center and edge comes out clean. Wait 10 minutes before slicing to serve. Garnish with parsley.
Onion-Cheese Quiche comes from the Cook'n Deluxe collection. Click here to order this CD or download this brand-name recipe set right now!