175g crushed Gluten Free biscuits (any flavour you like, with the possible exception of chocolate chip cookies!)

50g melted butter

½ - 1 tsp cinnamon (optional)

Crush the biscuits (putting them in a closed plastic bag and attacking with a rolling pin is the easiest and most satisfying approach) and place in a medium sized bowl.  Add melted butter and spice and mix thoroughly.  (Yes, it is OK to use your hands for this!)

Press the mix very firmly into the base of a preferably springform or other loose-based 23cm diameter pan.

It helps to press this down thoroughly with the back of the spoon.

Chill the mix thoroughly for an hour or so before add fillings.