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Several hours before, place 2 bananas in the freezer until the skins go black, then remove and defrost. You’ll be left with really soft bananas. Peel, then mash well and set aside.
Mix the butter and biscuits together, then press into a 22cm springform cake tin. Whip the cream until it just holds its shape. In a separate bowl, beat the sugar, soft cheese and vanilla together until completely combined. In another bowl, beat the peanut butter to loosen it.
Fold the cheese mixture into the peanut butter, then tip in the mashed banana and gently fold in the cream. Spread the mix over the biscuit base and smooth the top. Freeze for several hours or preferably overnight. To serve, leave the cake in the fridge for 20 mins, then run a knife around the side and remove the sides of the tin. Slice the remaining banana and use to decorate the cheesecake.