Preheat oven to 375F (190C)

Beat 200 g (7.2 oz) Unsalted Butter at room temperature together with 120 g (4.2 oz) Sugar and 1 tsp Vanilla Extract to a cream consistency

Add 1 Egg and mix together

Add 375 g (13.2 oz) All-Purpose Flour, 1/4 tsp Baking Powder, and 1/4 tsp Salt. Mix with a paddle attachment. You will have a soft dough. Make a ball and wrap it. Put in a fridge to chill for 30 minutes

Roast and chop 100 g (3.5 oz) of Peanuts

Divide the chilled dough into 2 pieces (it will be easier to work with)

Roll the dough to 8mm thick

Cut the Cookies with a cookie-cutter

Beat 1 Egg White and brush Cookies with it. Sprinkle them with the chopped Peanuts

Bake for 15 minutes at 375F (190C) until golden brown