Preheat oven to 450°F (230°C).

In a large bowl, sift together dry ingredients. Cut in butter until mixture resembles coarse oatmeal.

Make a well in the center of the dry mixture and pour in the milk. Stir until dough begins to pull together, then turn out onto a lightly floured surface.

Press dough together and then roll out until 3/4 inch thick. Cut into 2-inch round biscuits and place on an ungreased baking sheet.