Stir together the peanut butter, maple syrup and vanilla until combined. Add in the oats, flax, cocoa powder (sifted if lumpy) and espresso powder then stir until a dough forms. If the dough is dry add in 1-2 tablespoons of milk or water.

Scoop the dough into tablespoon size portions and roll into a ball with your hands. Stored the energy bites in an airtight container in the refrigerator for up to a week or in the freezer for several months.