Beat the softened butter, sugar and eggs until creamy. Stir in the nuts and coffee. Mix the flour with the cocoa powder and baking powder, then stir in with the milk.
The dough must be a little softer than normal batter, if necessary add a dash of milk or coffee. Spread the dough in a greased dish and bake in the preheated oven at approx. 175 ° C for 50-60 minutes. Make a chopstick test.
The cake tastes best if you let it cool and steep in the pan overnight or for about 12-18 hours, it will then be juicier. Then dust with powdered sugar or cover with any glaze as desired.