Combine dry ingredients in the bowl of an electric mixer with the paddle attachment on. Add the butter and mix on low speed until the butter is the size of peas.
Dump the dough out on a lightly-floured surface and pat into a 3/4 inch tall square. Cut out circles with a 2 to 2 1/2 inch biscuit cutter (or glass) and place on a cookie sheet. (The key to good biscuits is not working the dough too much - as light a touch as you can manage is best).
(adapted from Ina Garten)