Place all ingredients in a large food processor and pulse until finely chopped, almost the consistency of sand. This may take 4-5 minutes. Remove blade and put aside.
Scoop mixture out one at a time using a small ice cream scoop. Form mixture into balls by rolling in between your hands.
Enjoy room temperature or refrigerate in an air-tight container for up to 7 days.
Don't be afraid to press the mixture tightly together with your hands when forming balls. As the heat of your hand warms up the mixture, the natural oils in the walnuts will release helping to bind the balls.