Combine the crushed biscuits with the melted butter and cocoa and press into a tin. Chill in the fridge while you make the topping.
Beat the cream cheese with the icing sugar until it's just combined, don't overmix.
Add in the double cream and Baileys and whisk until very thick. Use an electric whisk if you have one.
Remove the base from the fridge and add the cheesecake mixture, smoothing the top.
Pop into the fridge for at least 3 hours (or overnight is much better if you don't need it until the next day).
When you are almost ready to serve the cheesecake, melt the chocolate very gently in a bowl, sitting over a pan of simmering water. (Don't let the bowl touch the water!)
When the chocolate is melted, allow to cool for about 10 minutes. It should be body temperature (so you can't feel it when you touch it with your finger).
Remove the cheesecake from the fridge and take out of the tin (see tips above). Gently drizzle over the chocolate, working quickly. Add decorations. (See notes).
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Calories: 560kcal | Carbohydrates: 45g | Protein: 9g | Fat: 38g | Saturated Fat: 22g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 10g | Trans Fat: 0.5g | Cholesterol: 104mg | Sodium: 515mg | Potassium: 301mg | Fiber: 2g | Sugar: 25g | Vitamin A: 1230IU | Vitamin C: 0.2mg | Calcium: 167mg | Iron: 2mg