Firstly separate the onion slices into rings, and set aside. In a small bowl, stir together the flour, baking powder and salt.

Next 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 plat

Heat the oil in a deep-fryer and fry the onions.

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