Preheat oven to Preheat the oven to 400F. Lightly butter a 1-1/2 quart baking dish.
Combine first set of ingredients. Spread in the bottom of dish. Stir together flour, baking powder, and sugar with wire whisk. Cut the butter into the flour mixture, until it forms coarse crumbs. Combine milk, buttermilk, and egg. Add to flour mixture. Do not knead; the dough will be sticky, stiff, and lumpy. Drop by the spoonful over the peaches.
Bake for 25 minutes or until the top is golden and the juices are bubbling. Cool on a wire rack for about 5 minutes. Then loosen the biscuit from the sides of the pan and invert onto a serving platter.