01 - Peel the onions and cut them into thick slices about 1/2 inch wide. Carefully separate the slices into double-ring layers, leaving one ring nested inside another to create a pocket for the filling.
02 - In a mixing bowl, combine the softened cream cheese, shredded cheddar, shredded mozzarella, and finely diced jalapeños. Stir until all ingredients are evenly distributed and the mixture is smooth.
03 - Using a small spoon or spatula, gently spread the cheese filling between the walls of each double onion ring. Press firmly to seal the rings together. Continue until all onion rings and filling are used.
04 - Arrange three shallow dishes: the first with all-purpose flour, the second with eggs and milk whisked together, and the third with panko breadcrumbs mixed with smoked paprika, garlic powder, salt, and black pepper.
05 - Dredge each stuffed onion ring in flour, shaking off excess. Dip into the egg wash, then coat generously with the seasoned panko mixture. For an extra-crispy crust, repeat the egg and panko steps a second time.
06 - Arrange the breaded rings on a parchment-lined baking sheet and place in the freezer for 30 minutes. This step firms the filling and helps the coating adhere during frying.
07 - Heat the vegetable oil in a heavy-bottomed pot or deep fryer to 350°F. Fry the onion rings in small batches for 2 to 4 minutes, turning once, until deep golden brown and crisp. Transfer to a plate lined with paper towels to drain.
08 - Serve immediately while hot and crispy, alongside ranch dressing, chipotle mayo, or fresh salsa for dipping.