Preheat oven to 450 degrees.

In a large mixing bowl. combine the flours, baking powder, sugar, salt and cream of tartar.  Add butter and using a pastry blender, cut butter into mixture until the butter is the size of small peas.  Make a well in the center, add egg and milk and combine with a fork until all of the dry ingredients are moist.  Turn dough onto a well floured surface and knead until all is smooth and all dry ingredients are incorporated.  Roll dough to 3/4 inch thick, cut with three inch cutter.  Place biscuits on parchment lined baking sheet, 1/4 inch apart.  Bake 12 minutes or until golden brown.