In a large bowl, combine the flour, sugar, baking powder and baking soda. Cut in butter until mixture resembles coarse crumbs. In a small bowl, whisk egg and buttermilk until blended; add to crumb mixture just until moistened.
Turn dough onto a lightly floured surface; gently knead 10 times. Divide dough in half; pat each portion into a 5-in. circle. Cut each circle into six wedges.
Separate wedges and place 1 in. apart on an ungreased baking sheet. Bake at 350° for 25-30 minutes or until golden brown. Serve warm, with jam if desired.
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