biscuit baking mix (bisquick)
light cream (half&half)
TO MAKE THE PASTRY, chop butter into the biscuit mix, work in cream, and roll out on lightly floured board; or press into a 9 inch pie plate, fluting the edges.
Chill while preparing filling.
FOR THE FILLING, cook onion in butter until golden; cool slightly.
Add eggs, cheese, and salt.
Pour this mixture into pastry, and bake in oven preheated to 425 degrees F. (very hot) for 15 minutes; then reduce heat to 350℉ (180℃). (moderate) and continue baking 25 to 30 minutes or until a knife inserted in the center comes out clean.