Line and grease a 5 x 5 x 3 inch* square baking tin with two long pieces of baking parchment so they cross in the middle and come up and over the sides of the tin.
Place all the ingredients in a food processor and combine for 3-5 minutes until all the components have broken down and come together into a sticky ball.
Tip the mixture into the baking tin, press down on top so the surface is even.
Place in the fridge for a couple of hours to firm up then carefully remove from the tin, using the long ends of the baking parchment as leverage and cut into 12 bars.
Store the bars in the fridge in between snacking for about a week.
Notes
*I originally used a different baking tin for the bars made in the photos. This tin will make slightly wider shaped bars.