Line baking trays with baking paper. Coarsely chop the nuts. Cream butter, sugar and salt. Stir in eggs one by one, then cream. Mix flour and cocoa, knead in. Knead in nuts, form to approx. 50 balls.
Place on the sheets, press them flat a little. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 15 minutes. Let it cool down.