Preheat the oven to 160C

Line a 9" square cake tine with baking parchment or tinned foil

Crush the biscuits finely into a large bowl

Mix in the butter, beaten egg and Rice Krispies and Marshmallows

Bake for 15mins

Coat the apple in the flour and sprinkle on top of the baked biscuit mixture

Cover with the tin of Caramel

Bake for 25 mins

Cut into cubes whilst still warm and soft

Refridgerate for 2 hours