Grease a fat pan (35 x 39 cm; deep baking tray) and dust with flour. Preheat the oven (electric cooker: 175°C/circulating air: 150°C/gas: stage 2.) Break 150 g chocolate into pieces. Melt together with the butter at low heat, let cool down a little.
Roughly chop 250 g chocolate. Mix flour, brown sugar, almonds, 1 pinch of salt, cocoa, baking powder and vanilla sugar in a bowl. Place the eggs in a mixing bowl and whisk until creamy.
Stir in the liquid butter-chocolate mixture. First stir in the flour mixture, then the crème fraiche. Fold in 75 g chopped chocolate. Put the dough into the fat pan and smooth it down. Bake in the oven for 25-30 minutes.
Let it cool down.
Coarsely chop the peanuts and roast them in a pan without fat. Take out and let cool down. Mix cream cheese, peanut butter (both at room temperature!) and sugar. Stir in 150 g peanuts.
Cut the dough sheet in half crosswise. Spread half of the cream on a pastry sheet and smooth it down. Place the second pastry sheet on top, add the rest of the cream and smooth it down. Spread 50 g peanuts and 75 g chopped chocolate on top, press lightly.
Cover and leave to cool for at least 2 hours.
Melt 100 g chopped chocolate in a hot water bath and let it cool down a little. Cut the chocolate-peanut cake into approx. 28 cubes (approx. 5 x 5 cm). Run some liquid chocolate over each cube.
Let it set.