Melt the butter in a saucepan over a medium heat. Meanwhile, crush the digestives into a fine crumb. You can use a food processor or place the biscuits into a large sandwich bag and beat it with a rolling pin.
Mix the melted butter with the crushed digestives until it resembles wet sand. Press it down into a 20 cm springform tin, then place it into the fridge whilst you get the filling ready.
Melt the chocolate in a heat proof bowl over a pan of simmering water. Set it aside to cool slightly.
In a large mixing bowl, add the cream cheese, vanilla bean paste, icing sugar, and melted chocolate. Use an electric whisk to beat it until well combined.
In a separate bowl, and using a clean whisk, whip the double cream until it reaches stiff peaks. Fold the whipped cream through the cheese mixture.
Place the mini eggs into a large sandwich bag, use a rolling pin to crush them, then fold them through the cheesecake filling.
Spoon the filling on top of the biscuit base, use a spoon to smooth it out, then place it in the fridge to set for at least 4 hours, but ideally overnight.
For the top, whip the double cream until it reaches stiff peaks.
Spoon or pipe the whipped cream over the top of the cheesecake however you like. Finish with the mini eggs, some crushed and some whole.