Follow the base nut butter recipe (above) until the end of Step 5.
Stop the processor. Add the cacao powder, fit the lid back onto the processor and blitz until the cacao is incorporated.
You may need to scrape the cocoa powder off the sides of the food processor bowl as it tends to fly up a bit.
Add the extra almond milk and maple syrup and blitz until well incorporated and the mixture is smooth (and a little shiny).