Prepare the Base
Crush the shortcake biscuits into fine crumbs (a food processor works best, but a rolling pin and bag also do the trick).
Mix the crumbs with melted butter until evenly coated.
Press firmly into the base of a 9-inch springform tin. Chill in the fridge for at least 30 minutes while you prepare the filling.
Make the Cheesecake Filling
In a large bowl, beat together the cream cheese and icing sugar until smooth and fluffy.
In a separate bowl, whip the double cream until soft peaks form.
Gently fold the whipped cream into the cream cheese mixture.
Add 2 tbsp caramel sauce and swirl lightly for a marbled effect.
Spread the filling over the chilled biscuit base and smooth the top. Chill for at least 4–6 hours (overnight works best).
Prepare the Ganache Topping
Heat the double cream in a small saucepan until just steaming (do not boil).
Pour the hot cream over chopped milk chocolate in a bowl. Let sit for 2 minutes, then stir until smooth and glossy.
Allow to cool slightly before pouring over the chilled cheesecake.
Decorate with Caramel & Twix
Drizzle 4 tbsp caramel sauce over the chocolate topping.
Garnish with Twix fingers arranged in halves or chunks on top.
Chill & Serve
Return the cheesecake to the fridge for 1–2 hours until fully set.
Slice with a sharp knife dipped in hot water for neat portions.