01 - Preheat your oven to 425°F. Line a large baking sheet with parchment paper and lightly spray with olive oil.
02 - Separate onion slices into individual rings, discarding the smallest centers.
03 - Arrange three shallow bowls. Bowl 1: combine flour, salt, and black pepper. Bowl 2: whisk eggs with milk. Bowl 3: mix panko breadcrumbs, smoked paprika, and garlic powder.
04 - Dredge each onion ring in flour mixture, shaking off excess. Dip into egg mixture, then coat thoroughly with panko mixture. Press gently to help crumbs adhere.
05 - Place coated rings on prepared baking sheet in single layer without crowding. Lightly spray tops with olive oil.
06 - Bake for 12-15 minutes until lightly golden.
07 - Flip each ring, spray again with olive oil, and bake for another 8-10 minutes until golden brown and crispy.
08 - While onion rings bake, whisk together mayonnaise, sour cream, buttermilk, chives, parsley, dill, garlic powder, onion powder, salt, pepper, and lemon juice until smooth and creamy. Refrigerate until serving.
09 - Serve hot crispy onion rings immediately with chilled ranch dressing on the side.