Drain and rinse the soaked cashews, then add to a blender along with the oat milk. Blend until smooth
Pour into a saucepan along with the rest of the ingredients. Heat until everything is melted, then take off the heat and pour into a wide bowl.
Allow to cool, then transfer to the fridge to set (around 4 hours).
Use a small ice cream scoop or a spoon to scoop the set truffle mixture and shape into walnut sized balls.
Place on a sheet lined with baking paper and freeze for 30-60 minutes.
Break up the dark chocolate into a heat-proof bowl and add the coconut oil. Melt in the microwave, then dip each truffle to coat.
Refrigerate again until the chocolate is set.