Melt dark chocolate and butter in a double boiler.
Mix eggs and oligosaccharide in a bowl.
Add the egg mixture to the melted chocolate mixture and mix well.
Sift almond flour, cocoa powder, and salt into the mixture and combine.
Add cacao nibs and mix evenly.
Pour the batter into the mold and sprinkle cacao nibs on top.
Bake in a 170°C oven for 20 minutes.
After cooling, cut into bite-sized pieces.