Oreo cheesecake with white and dark chocolate ganache

Process the 26 Oreos to crumbs, pulse in the melted butter and mix once more by hand to a wet sandy mixture that clumps.

Tip into a springform pan and tamp down with a flat bottomed glass, pressing a wall up the sides and fixing any gaps last.

Bake the crust at 350 for 10 minutes until fragrant.

Chop 12 Oreos into quarters or thirds and finely chop 12 more.

Beat the soft cream cheese with the salt and sugar on medium, sifting in the flour as it runs, until creamy and homogenous; scrape the bowl.

Mix in the sour cream and the vanilla.

On medium low add the eggs one at a time, waiting for each to incorporate, then the egg yolk.

Fold in the finely chopped Oreos until almost incorporated; do not overmix.

Layer a third of the batter in the pan, half the chopped Oreos, another third of batter, the rest of the Oreos, then the remaining batter; shimmy to level and surface the air bubbles.

Set the pan on a rimmed baking sheet, bake at 350 for 10 minutes, then reduce to 300 and bake a further 40 to 50 minutes until there is a slight wobble in the centre.

For insurance against cracking, put a dish of an inch of hot water on the bottom shelf of the oven.

Chop the white chocolate small into a microwave safe bowl, add the heavy cream and microwave in bursts, stirring between, until silky; it took 30 seconds then 20.

Finely chop the dark chocolate, add a tablespoon of cream and microwave in 20 second bursts, stirring between.

Cool the cheesecake; the cracks close as it cools and can be pressed together.

Run a knife or offset spatula round to break the seal and release the ring, then slide the cake onto a stand.

Pour the white ganache into a pool in the centre and smooth it towards the edge; drop blobs of the dark chocolate on it and swirl with a skewer to marble.

Chill.

Whip the cold heavy cream with the powdered sugar and vanilla, starting on low and finishing by hand at very soft peaks.

Pipe a rope pattern round the top with a star tip on a turntable and set Oreo halves along the border every two swirls.