.
Melt dark chocolate and butter together using a double boiler.
Add erythritol to the melted chocolate and mix well.
Add eggs one at a time, mixing thoroughly after each addition.
Add almond flour, baking powder, and salt, and mix to form the batter.
Line the baking pan with parchment paper, pour in the batter, and spread it evenly.
Bake in a preheated oven at 180°C for 20 minutes.
Let it cool completely, then cut into appropriately sized pieces.