Pre-heat oven to 400 degrees
In a medium sized bowl mix the flour, sugar, salt and baking powder together.
Using a grater, grate the butter into the flour mixture. Cute the flour into the butter using a pastry cutter until it is in small crumbs.
In a separate bowl, whisk together the sourdough discard, egg, vanilla and milk together. Then stir in the chocolate chunks.
Pour the wet ingredients into the dry ingredient and mix until combined. the dough will be stiff.
Place the dough on a lightly floured surface and use your hands to shape it into a 9" round or disk shape. If you have a 9" round baking pan you can place it over the dough to make sure it is an even shape.
Using a bench scraper or knife cut the dough into 8 wedges and place on the silicon mat.
Brush the top of the scones with melted butter and sprinkle the sugar over the scones.
Place the scones in the oven and bake for 20 minutes or until scones are golden brown.