I have a box of graham crackers that I brought back from the States and I was looking for something I could make with them that I could take to work and hand out for my birthday. These were perfect and they were gorgeous, so lovely and squidgy. I suspect that it wouldn't work with digestive biscuits, in the same way that they don't work for a pie crust.
Graham Cracker Brownies (from Multiply Goodness)
22 graham cracker squares (11 rectangles)
1 14-ounce can sweetened condensed milk
1 cup semi-sweet chocolate chips
Preheat the oven to 180C.
Place the graham crackers in a large ziploc bag, pressing out any extra air, then sealing the bag. Use a rolling pin to crush the graham crackers into fine crumbs.
Transfer the graham cracker crumbs into a medium-size mixing bowl, then add the sweetened condensed milk and chocolate chips. Stir thoroughly until everything is well combined.
Pour the mixture into a well-greased 20cm x 20cm baking pan, then bake in the preheated oven for 25 mins.
Remove the brownies from the oven and let them cool for 30 mins, then cut and remove from the pan.