In a bowl, combine flours, brown sugar, baking powder and baking soda. Cut in butter until mixture resembles coarse crumbs. Stir in buttermilk until a soft dough forms. Turn onto a lightly floured board and knead gently 10-12 times or until no longer sticky.
Divide dough in half; gently pat or roll each half into an 8-in. circle 1/2 in thick. Cut each circle into eight wedges. Separate wedges and place on an ungreased baking sheet. Bake at 400° for 15-18 minutes.
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