In a large mixing bowl, combine your flours, protein powder, salt and granulated sweetener and set aside. In a microwave safe bowl or stovetop, melt your nut butter with the maple syrup. Whisk in the vanilla extract and pour into the dry mixture. Mix very well until fully incorporated. If batter is too thick (it generally is), add a tablespoon of dairy-free milk, until a thick batter is formed. If batter is too thin, add a dash more flour until a thick batter is formed. Stir in optional sprinkles and form into bite sized balls. Refrigerate for at least 10 minutes, or until firm.