Begin by making the biscuits. Preheat the oven to 425F. In a medium bowl add the flour, baking powder, sugar, and salt. Mix until combined.
Cut the butter into small pieces and add it to the dry ingredients. Use your hands to break the butter into smaller pieces, about the size of a pea. Add the milk and stir until just combined.
Dump the dough onto a lightly floured surface. The dough will be very shaggy. Roll the dough into a 1/2" thick large rectangle. Cut the dough into 1 inch squares. Brush each square with whisked egg (optional).
Transfer the squares to a lined baking sheet and bake for 10-12 minutes, until the biscuits are golden brown.