First, crush the biscuits finely and mix with the melted butter. Place in a round cake tin and press down well. An even layer should form. Let it harden in the fridge. Mix the cream cheese and sugar thoroughly in a kitchen aid or with a hand mixer. Then, stirring constantly, gradually add the yolk, egg, sifted flour, vanilla essence and double cream. Pour into the mold, smooth the surface and bake on the given program.