Crushed biscuit mix with the butter and the walnuts and spread on the bottom of the form, size 26-27 cm. Put it in the refrigerator. Beaten cream cheese mixed with sugar, eggs, vanilla, banana puree and melted white chocolate. Pour the mixture over the base and bake 35-40 minutes at 170C degrees. Once cool garnish with banana cream, which is prepared as bananas are mashed and mixed with vanilla and sugar. Add egg whites and mix until fluffy cream. Put it in the fridge for 4-5 hours to set.