Pour one inch oil into a deep frying pan, heat to 375 degrees. Beat egg then add rest of ingredients. Cut onions in ¼-inch rings. Separate rings and dip into batter, one at a time, then drop into hot oil. Fry until golden brown; flip and continue to fry other side. Place onto a paper towel-lined platter.
Recipe by Amish 365 at https://www.amish365.com/the-amish-cook-crunchy-onion-rings/