Line the base of a slice tin with baking paper.
Thinly slice the Mars bars and set aside until needed.
Combine the biscuit crumbs and butter and press into the base of the slice tin. Place in the fridge to chill.
Melt the toblerone chocolate in the microwave, cooking for 30 second spurts until melted. Set aside to cool slightly.
Place the softened cream cheese in the bowl of an electric mixer and beat until smooth and creamy. Slowly add the condensed milk, vanilla essence and melted toblerone and beat until combined.
Pour over the biscuit base and gently press the Mars bar pieces on top.
Place in the fridge to set for 6 hours (preferably overnight) to set.
Slice into small pieces and serve.