Ingredients 1 large onion، cut into 14-inch slices 1 14 cups all-purpose flour 1 teaspoon baking powder 1 teaspoon salt 1 egg 1 cup milk، or as needed 34 cup dry bread crumbs seasoned salt to taste 1 quart oil for frying، or as needed
Heat the oil in a deep-fryer to 365 degrees F (185 degrees C).
Separate the onion slices into rings، and set aside. In a small bowl، stir together the flour، baking powder and salt.
Dip the onion slices into the flour mixture until they are all coated; set aside. Whisk the egg and milk into the flour mixture using a fork. Dip the floured rings into the batter to coat، then place on a wire rack to drain until the batter stops dripping. The wire rack may be placed over a sheet of aluminum foil for easier clean up. Spread the bread crumbs out on a plate or shallow dish. Place rings one at a time into the crumbs، and scoop the crumbs up over the ring to coat. Give it a hard tap as you remove it from the crumbs. The coating should cling very well. Repeat with remaining rings.
Deep fry the rings a few at a time for 2 to 3 minutes، or until golden brown. Remove to paper towels to drain. Season with seasoning salt، and serve.