Melt the dark chocolate and butter together using a double boiler.
Combine the eggs and erythritol in a bowl and mix well.
Add the melted chocolate and butter mixture to the egg mixture and mix until well combined.
Add almond flour, baking powder, and salt, then mix thoroughly.
Fold in extra dark chocolate chips to finish the dough.
Scoop the dough into round shapes on a baking pan and bake in the oven.