In a medium mixing, combine panko or whole wheat bread crumbs, flour, salt, pepper and baking powder. Separate the onion slices into individual rings and add to the flour mixture, gently toss and make sure all the rings are coated. Remove onions and set aside.
Whisk together milk and egg white, add to the leftover flour mixture and stir to combine. Dip onion rings into batter, allow excess to drip off and place on a non-stick cookie sheet. Lightly spray or drizzle extra-virgin olive oil on the onion rings. Flip onion rings after 10 minutes. Continue baking until golden and crispy, 10 to 15 additional minutes.
Notes
If using this recipe for Green Bean Casserole, reduce cooking time by 5 minutes as the onion rings will continue to brown while on top of the casserole.Check out our recipe for Green Bean Casserole.