Combine the oat pulp, peanut butter, maple syrup and salt until a smooth batter is formed. Place in the fridge for at least 1 hour until the mixture is more firm, and able to be rolled into balls.
Using clean wet hands, roll the mixture into truffles. Add the cocoa powder to a plate, and roll the peanut butter truffles to coat. Alternatively, roll in shredded coconut or crushed walnuts, depending on preference.
Enjoy immediately, or store in an air tight container for up to 3 days.