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).
Dip onions in batter, coating evenly.
Fry in hot oil, turning once to brown evenly on both sides. Work in batches as needed to avoid overcrowding the pan. Remove from oil and drain on paper towels.
Notes
Cook’s Note
I also use this batter for zucchini, eggplant, jalapeños, etc.
Editor's Note
We have determined the nutritional value of oil for frying based on a retention value of 10% after cooking. The exact amount may vary depending on cook time and temperature, ingredient density, and the specific type of oil used.