In a small pot, combine the butter or coconut oil, sweetener, cacao and cinnamon over a low heat, stirring until combined (a few minutes).
For a tastier slice, toast the oats, nuts, seeds and coconut in a large pan over a low heat for 5-10 minutes, stirring often (the coconut will colour). Or if you’d prefer, simply combine the dried ingredients raw.
Allow to cool a little (if you’ve chosen to toast) and then pulse (quickly) in your food processor a couple of times to chop the nuts a little.
Add the wet ingredients and mix together until well combined.
Use a big wet serving spoon to press firmly into a small slice tin lined with baking paper.
Place in the freezer for 10 minutes to set.
Once set, remove from the tin and cut into squares.