In a large bowl, mix the flour and baking powder. Add the very cold butter and rub it in with your fingertips until you achieve a sandy texture, resembling breadcrumbs.In another bowl, beat the eggs with the milk and sugar. Pour this mixture over the dry ingredients and mix quickly until the dough forms.Bring the dough together without kneading, then roll it out to a thickness of 3 cm. Cut out 12 triangles and reserve in the refrigerator.Brush with egg wash and bake until the scones are golden brown.