Add all ingredients to a food processor and blend until smooth, approximately 40-60 seconds.
Spoon the mix in to a lined baking dish or tray (we used a 10” x 10”) then use your hands to press the mix flat. The surface will be uneven, so then use the back of a spoon to spread flat (you may need to wet the spoon with water to stop the mix sticking to the spoon).
If using the extra chocolate to top, melt, then drizzle across the slice.
Place in the fridge for 2 hours to fully set before slicing and serving.
Store in the fridge for up to 7 days, or freeze individual slices for up to 2 months.
