In a separate bowl, combine quinoa, egg yolks, vanilla extract, oil, milk and nut butter, if using. Add to dry mixture and stir well.
To keep waffles warm until you are done cooking all of them, preheat oven to 250 and put cooked waffles directly on oven rack until ready to eat. To save time, you can prepare the batter the night before up to the addition of the egg whites. Store overnight in refrigerator. Prior to cooking, beat egg whites and combine with cold batter.