1. Preheat oven to 180 degrees Celsius.

2. In a bowl, cream together 200g butter, 150g sugar, and 150g brown sugar.

3. Add 2 eggs and mix well.

4. Add 1 tsp vanilla extract and mix until combined.

5. In a separate bowl, combine 300g all-purpose flour, 1 tsp baking powder, and a pinch of salt.

6. Slowly add the dry ingredients to the butter mixture and mix until a dough forms.

7. Stir in 100g chopped peanuts.

8. Shape the dough into small balls and place them on a baking sheet lined with parchment paper.

9. Bake for approximately 10-12 minutes or until golden brown.

10. Remove from the oven and let cool.