Put the peanuts in a food processor and chop them up into small pieces by pulsing it a few times.
In a medium-sized pot, add the sweetened condensed milk, cocoa powder, espresso powder, and the chopped peanuts. Cook this mixture over medium-low heat for about 10 minutes. Keep stirring it so it doesn't stick to the bottom and burn.
Spread out the mixture onto a baking sheet lined with parchment paper. Let it sit and cool down for about 15 minutes.
Once it's cooled, put the baking sheet in the fridge for around 45 minutes until the mixture is cold and firm.
Take 1 ½ tablespoons of the mixture and shape it into a ball with your hands. Do this with the rest of the mixture.
Roll the balls into your favorite coating. We used powdered sugar, cocoa powder, or sprinkles. Enjoy these delicious treats!