Preheat your oven to 325°F (160°C) and line a large baking sheet with parchment paper or a silicone mat.
In a big bowl, whisk together the almond flour, brown sugar replacement, coconut flour, whey protein powder, baking powder, espresso powder, and salt until well combined.
Grate the frozen butter directly into the dry mix and toss gently to combine. Then, stir in the large egg, heavy whipping cream, and vanilla extract until everything just comes together into a dough. Gently fold in the chopped sugar-free dark chocolate.
Transfer the dough onto your prepared baking sheet. Pat it into a neat 7-inch round circle. Using a very sharp knife, cut the circle into 8 even wedges, pressing straight down for clean cuts.
Carefully spread the scone wedges apart on the baking sheet so they have room to bake. Bake for 20-25 minutes, or until the edges are beautifully golden brown and the tops feel firm to the touch.
Take them out of the oven and let them cool completely on the pan. This step is important before glazing!
In a small bowl, whisk the powdered sweetener with the cold coffee until smooth and a drizzling consistency. Add a tiny bit more coffee if you need to thin it out further.
Drizzle this delicious glaze generously over your completely cooled scones.