First start making your coffee in whatever coffee device you have at your home. Then in high speed blender either make your cashew milk with the dates or use whatever non-dairy milk you prefer. Blend until smooth.
In a small pot on the stove, heat the date milk mix. Once the milk is heated it should be a little frothy. Split the coffee between two cups and top it off with the date sweetened milk. I usually fill the cup with half coffee, half date milk.
If you have a frother, use it now to make a little foam. It doesn't change the flavor so mixing with a spoon is good too.