Line a 7in tin or dish with greaseproof paper

Crush up the oreos into small pieces

Melt the white chocolate along with 1teaspoon of butter on the hob or in the microwave stirring occasionally

Mix in half the oreos into the melted white chocolate

Melt 100g of the milk chocolate with the remaining butter

Mix the remaining oreos into the milk chocolate leaving a little Oreo crumb to decorate

Press half the milk chocolate mix into the bottom of the dish

Next press half the white chocolate mix on top of the milk chocolate

Pour the remaining milk chocolate mix on top and then finish off with the remaining white chocolate mix

Melt the final 10g of milk chocolate and pour over the top and even out. Then sprinkle some Oreo crumb to decorate

Leave in the fridge to set for about an hour then cut into slices and enjoy