Mix together flour, baking powder, baking soda, salt. With your clean hands, combine butter into flour mixture until crumbly like cornmeal. Blend egg and milk together. Add to flour/butter mixture. Mix until combined and knead until dough is soft and workable. Be cautious not to over-knead. On a lightly flour-dusted counter top, pat dough until it is approx ¾ to 1 inch thick. Using a biscuit cutter or drinking glass dipped in flour, cut dough into circles and put on a lightly greased cookie sheet. Bake for 10 to 15 minutes in a 400 degree oven.