Make the base: Crush the biscuits until they look like lumpy sand. (I do mind in a food processor but you can do this by hand!)
Mix with the melted butter and press into your 18cm (7") springform pan (US)/loose-bottomed tin.
Whip the cream: Take the cream straight from the fridge (this helps to keep it stable) and whip enough so it holds its shape (to the texture of ice cream). Take care with it - too runny and it will be sloppy, too stiff and it will be too dense.
Make the cream filling: Mix the whipped double cream, sifted icing sugar and cream cheese until fully combined. Stir in the melted cooled and chocolate and mini marshmallows.
Spoon on top of the biscuit base. Smooth the top with the back of a spoon or a palette knife if you have one.
To set: Chill for at least 3 hours or, even better, overnight.
To serve: Use my knife tip (below) to remove the cheesecake from the tin. Pile the additional marshmallows and chocolates on top.
Melt your dark chocolate and when slightly cooled drizzled on top. For clean slices, dip your knife in hot water and wipe dry between each cut.
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