Combine flour, egg, parsley, garlic powder, oregano, salt, and pepper in a shallow bowl. Gradually add beer, stirring, until a thick batter forms. Add more or less beer depending on the desired consistency of the batter.
Heat oil in a heavy frying pan over medium-high heat (adjust amount, depending on the size of your pan, so that you have a couple of inches of oil). When oil is hot, dip onions in batter and fry, turning once to brown evenly on both sides. Drain on paper towels.
