Coarsely chop the peanuts.
Melt the dark chocolate using a double boiler.
In a bowl, mix almond flour, egg, baking powder, and salt.
Add the melted chocolate to the batter and mix.
Add the chopped peanuts and mix one more time.
Pour the batter into a bread pan and flatten it.
Bake in a preheated oven at 180°C for 20 minutes.
Cool and remove from the pan.