01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper and lightly coat with cooking spray or olive oil.
02 - Peel onions and slice into 1/2-inch thick rings, then separate into individual rings.
03 - Set up three shallow bowls: combine flour, salt, and pepper in the first; whisk eggs and milk in the second; mix panko breadcrumbs with smoked paprika and garlic powder in the third.
04 - Dredge each onion ring in the flour mixture, shaking off excess; dip into the egg wash; then cover evenly with the seasoned breadcrumbs.
05 - Place coated rings in a single layer on the baking sheet and lightly spray or drizzle with olive oil for crispiness.
06 - Bake for 10 minutes, flip each ring, then continue baking for another 8 to 10 minutes until golden brown and crisp.
07 - Serve hot with preferred dipping sauces such as ranch, spicy mayo, or ketchup.