Prepare the Cookie Mixture: Crush the cookies into fine crumbs and mix them with 120g of chopped peanuts in a large bowl.

Make the Cocoa Mixture: In a saucepan, combine the sugar, cocoa powder, and milk. Bring the mixture to a boil, stirring continuously to dissolve the sugar and cocoa. Once boiling, reduce the heat and simmer for 2 minutes. Remove from heat and add the butter and a pinch of vanillin, stirring until smooth. Allow the cocoa mixture to cool to room temperature.

Form the Balls: Pour the cooled cocoa mixture over the cookie and peanut mixture. Mix thoroughly until well combined. Lubricate your hands with vegetable oil and form the mixture into small balls. Place on a baking sheet lined with parchment paper and refrigerate for 1 hour.

Coat with Chocolate: Melt the dark chocolate and milk chocolate with vegetable oil. Dip each cookie ball into the melted chocolate, ensuring full coating. Place on the parchment-lined baking sheet.

Garnish and Chill: Sprinkle the coated balls with chopped peanuts for garnish. Refrigerate for 20 minutes to set the chocolate.

Serve: The cookie balls are ready to serve once the chocolate is set. Enjoy chilled or at room temperature.