Slice your onion into thick rings (about ½ inch) and pair up similar-sized rings. Gently place a mozzarella stick between each onion ring pair.

Set up your breading station: Place flour in one bowl, whisk eggs and milk together in another, and combine breadcrumbs, garlic powder, paprika, salt, and pepper in a third bowl.

Dredge each onion ring in the flour, shaking off any excess. Then dip it in the egg mixture, letting any excess drip off, and finally coat completely in the breadcrumbs. For extra-crispy rings, repeat the egg and breadcrumb steps.

Chill those breaded rings in the fridge for 20-30 minutes. This helps the breading set and prevents it from falling off during frying.

Heat your vegetable oil in a large pot to 350°F (175°C). Use a thermometer to ensure it's at the right temperature. Fry the onion rings in batches, for about 2-3 minutes per side, until they’re golden brown and crispy. Don't overcrowd the pot!

Remove the onion rings from the oil and place them on a wire rack or paper towels to drain excess oil.

Serve immediately and enjoy the warm, cheesy, crispy goodness!