Make the base: Combine the crushed Oreo biscuits with the melted butter and press into a 18cm (7") springform pan (US)/loose-bottomed tin (UK). Chill in the fridge while you make the topping.
Whip the creamy filling: Pour the double cream into a bowl, add the cream cheese and whisk until it's very thick – almost the consistency of ice cream. Use an electric whisk if you have one.
Carefully fold in the crushed Oreos.
Assemble the cheesecake: Remove the base from the fridge and add the cheesecake mixture, smoothing the top.
Chill: Pop into the fridge for at least 3 hours (or overnight is much better if you don't need it until the next day).
To serve: When you ready to serve the cheesecake, melt the dark chocolate. You can do this a bowl over a pan of boiling water, or in the microwave. To microwave heat in 30 second blasts, stirring carefully in between until the chocolate is melted.
Remove the cheesecake from the tin using the notes below, drizzle over (or use a piping bag if you prefer) the melted dark chocolate and evenly space 12 mini Oreos around the edge.
Store the cheesecake in the fridge until ready to serve. For clean slices, dip your knife in hot water and wipe dry between each cut.
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Calories: 532kcal | Carbohydrates: 40g | Protein: 6g | Fat: 40g | Saturated Fat: 21g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 12g | Trans Fat: 0.2g | Cholesterol: 76mg | Sodium: 330mg | Potassium: 265mg | Fiber: 3g | Sugar: 23g | Vitamin A: 979IU | Vitamin C: 0.2mg | Calcium: 69mg | Iron: 7mg