Crispy Onion Rings

1/4 cup all purpose flour
2 tsp. Creole seasoning
2 large egg whites
2 cups Panko bread crumbs
2 large sweet onions, sliced 1/2" thick and separated into rings

Heat oven to 450 degrees.  Coat 2 rimmed cookie sheets with cooking spray.  Whisk together flour and 1 tsp. of the seasoning in a small bowl.  Lightly beat egg whites in another small bowl.  In a third small bowl, combine panko and remaining 1 tsp. seasoning.  Dredge onion rings in flour mixture, gently shaking off excess.  Dip in egg whites, letting excess drip off.  Dredge in panko mixture to coat and place on prepared pans.  Coat onion rings lightly with cooking spray.  Bake 6 minutes.  Turn onion rings and bake until lightly browned, 4 to 6 minutes longer.  Serve immediately.