Preheat the oven to 180°C (350°F) and line a baking tray with baking paper.
Finely crush half the packet of Oreos.
Beat in the egg and vanilla extract.
Beat in the flour, baking powder and finely crushed Oreos.
Stir in the chunky Oreos, white chocolate chips and milk chocolate chips.
You can freeze dollops of Nutella on a plate for 1-2 hours before making the cookies for less mess.