Line a 8/9″ square tin with parchment paper and leave to the side.
In a large bowl, melt the white chocolate on a low heat over a double boiler and stir until smooth (or in the microwave on short bursts until fully melted).
Once its melted, add in the mini marshmallows, chopped Oreos, cherries and pistachios (hold back a handful of each for the topping though).
Fold together.
Pour into the tin and spread until its even.
Push onto the top some of the Oreos, marshmallows, cherries and pistachios!
Refrigerate until set, chop up, and enjoy!
Notes
If you would like to make this with milk or dark chocolate, you can add in 100g of butter and 100g of golden syrup when you are melting the chocolate and it'll make it delicious. However, I find this can be a little risky (it can split/curdle easily) and too sweet for the white chocolate so I leave it as just chocolate when using white!
You can easily half the recipe for less, but these are so moreish you will want the large piece! Trust me!
I used a mix of regular Oreos and Birthday Cake flavour Oreos in this, along with the pistachios, cherries and mini marshmallows. All of the filling types are optional, but I adore this combination with the Oreos!
This will last in the fridge for 2-3 weeks in an airtight container, or you can freeze it for up to 3 months!