Preheat the oven to 400 degrees F and prepare two cookie sheets with parchment paper.
Give the chocolate a rough chop, toss it in 2 tbsp of flour to coat it, and set aside.
In the bowl of a stand mixer with the paddle attachment, quickly mix together the flour, unsweetened shredded coconut, baking powder, and salt.
Cut up very cold butter into 1⁄2 inch cubes. I would recommend putting the butter in the freezer, after cutting it, for five minutes if you’re not sure if it’s cold enough. Add the cold butter and run the mixer on low until the butter is broken down to the size of peas, but no smaller. Be careful not to overmix at this stage.
In a separate, medium-sized bowl, whisk together the coconut cream, eggs, maple syrup, and sourdough starter.
Pour the wet ingredients into the dry ingredients until just combined. Then add the chocolate and stir again. There may still be some dry flour at the bottom.
Dump the dough out onto a lightly floured cold counter and knead the dry flour until incorporated, being careful not to over knead. You want to see bits of unincorporated butter visible in the dough.
Flour a rolling pin and roll the dough out in a sheet approximately one inch thick.
Cut the dough with a round cutter sized approximately three inches across. I used a kitchen glass for this.
You will need to reroll the dough a few times to cut more scones. Arrange the scones across the two prepared cookie sheets and brush lightly with whisked egg wash, then sprinkle generously with sugar.
Bake for 20-22 minutes and switch the sheets in the oven halfway through the bake time to ensure the scones brown evenly.