Use a food processor. It works so much more easily that a blender. If you have a strong food processor it will even go more quickly.
Pour your peanuts into a food processor.
First you will get chunky crumbs.
Then it will start to stick together and to the sides of the processor. Turn off the processor and use a spatula to scrape down the sides.
Process for another 15 seconds and scrap again. Do this about 3-4 times.
Now process a little longer in between when you scrap down the sides and the peanuts will start to heat up and release it's oil which helps make it become a peanut butter.
In no time it will be creamy. I left mine a little chunky because I like it like this - sometimes. Go a little longer if you'd like creamy smooth. You are actually making peanut butter at this point.
Add the unsweetened cocoa powder, maple syrup and sea salt.
Process until all is incorporated completely.
Scoop into a jar with a tight fighting lid and eat whenever you want - like right now.