CREAM BUTTER, CREAM CHEESE and vanilla together in a mixer or processor. Reduce speed to low and add the flour. Mix until just incorporated. Remove the dough from the mixer, form into 3 balls and wrap in plastic wrap. Chill for one hour before using. Uncooked dough can be frozen for up to 2 months. Freeze uncooked balls of dough or freeze dough in pie tins. Makes 3 (10-inch) pies.