In a medium bowl, mix together peanut butter, flax meal, protein powder, vanilla and sweetener for about 1-2 minutes or until it begins to thicken.

Cover tightly with plastic wrap and refrigerate mixture for at least 1 hour or up to 1 day so that the peanut butter mixture can firm up.

Shape peanut butter into 1-inch balls, cover and refrigerate for at least 20 minutes to allow to firm up again.

Roll peanut butter balls in crushed peanuts or sweetener.