For the muffins, mix peanut butter, 25 g sugar and 1 vanilla sugar for about 1 minute until creamy. Place in the freezer for about 1 hour.
For the chocolate cream, coarsely chop 300 g of couverture. Bring the cream to the boil, remove from the stove. Dissolve the chopped chocolate coating in it. Let it cool down for about 15 minutes. Then chill for about 2 hours.
Line the recesses of a muffin tray (for 12 pieces) with paper baking cups. Coarsely chop 120 g of chocolate coating, melt in a hot water bath. Leave to cool. Cream butter, 125 g sugar, 1 vanilla sugar and 1 pinch of salt.
Stir in the eggs one by one. Let the melted chocolate coating shrink while stirring. Mix flour, cocoa and baking powder and stir in briefly.
Spread the dough into the moulds. Cut off peanut butter with a teaspoon and place it in the middle of each muffin. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for about 20 minutes.
Let it cool down.
Roughly chop the nuts. Stir the chocolate cream until creamy for about 1 minute. Pour into a piping bag (large star-shaped spout). Spray 1 tuff on each muffin. Sprinkle with nuts.