(Sorry there is no picture of the final product, but we ate them so quickly that I didn't get a picture this time around!!!)
1 box graham crackers (3 cello packs) or 1 large tube digestive biscuits, crushed
2 cans of sweetened condensed milk
12 oz of chocolate chips (350 g)
Add chocolate chips.
Put in a well greased 9x13 inch pan. Bake at 350 F/180 C for 25-30 minutes. Let cool and cut into squares to serve.