Preheat the oven to 180°C (356°F).
Mix almond flour and cocoa powder together.
Add allulose, melted butter, eggs, and vanilla extract, then mix well.
Fold in chopped dark chocolate or coconut flakes.
Pour the batter into a baking pan.
Bake in the preheated oven for 20 minutes.
Let it cool and cut into desired sizes.