Start by making the crust, place the sandwich cookies in a food processor and blitz to fine crumbs. (Alternatively, place them in a sealable freezer bag wrapped in a tea towel and bash them with a rolling pin.)
250 g (9 oz/ 23 cookies) chocolate sandwich cookies (such as Oreo)
Tip the crumbs into a bowl and stir in the melted vegan butter. The mixture should resemble wet sand.
75 g (⅓ cup) vegan block butter
Line the base and sides of a 20 cm/8 in springform cake tin with baking paper.
Tip the cookie crumbs into the tin and pack them down really firmly, use the base of a glass to help press them down. Pop it in the freezer while you prepare the filling.
Melt the chocolate and vegan butter together, either over a pan of gently simmering water (don't let the bowl touch the water) or in short bursts in the microwave, stirring often.
350 g (12 ½ oz) dark chocolate, 60 g (¼ cup) vegan block butter
Place the cream cheese OR silken tofu and lemon juice in a blender along with the yogurt, icing sugar, cocoa powder, espresso powder, vanilla, salt and the melted chocolate mixture and blitz until smooth. Stop and scrape down the sides as needed.
350 g (12 ½ oz) vegan cream cheese (OR 349g silken tofu + 1 Tablespoon lemon juice), 160 g (⅔ cup) plain Greek style non-dairy yogurt, 40 g (⅓ cup) icing (powdered) sugar, 20 g (2 ½ Tablespoons) cocoa powder, 1 teaspoon instant espresso powder, 1 teaspoon vanilla extract, ¼ teaspoon salt
Scrape the mixture on top of the cookie crust and spread it level. Refrigerate for at least 4 hours until set.
Once set, remove the sides of the tin and slide the cheesecake onto a plate before slicing.