Put flour, baking powder, sugar and salt in a bowl. Add eggs, fat, fine lemon peel and milk and mix with the whisk of the hand mixer to a creamy dough. Coarsely chop the nuts and fold them into the dough with the blueberries. Put 4-5 paper sleeves into each other.
Spread the dough into the paper sleeves so that they are 2/3 full. Place on a baking tray and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for approx. 35 minutes. Let it cool down and dust with icing sugar. Results in approx. 15 pieces