01 - Peel the onions and slice into thick rounds about 1/2 inch wide. Carefully separate each slice into nested double rings, leaving two layers intact 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 inner walls of each nested double onion ring. Press firmly to seal the edges. Continue until all onion rings and filling are used.
04 - Arrange three separate shallow dishes: the first with flour, the second with eggs whisked together with milk, 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 thoroughly with the seasoned panko mixture. For an extra-crispy crust, repeat the egg and panko steps a second time.
06 - Place all breaded rings on a parchment-lined baking sheet in a single layer. Transfer to the freezer for 30 minutes so the coating firms up and the filling holds together during frying.
07 - Heat vegetable oil in a heavy-bottomed pot or deep fryer to 350 °F. Fry the rings in small batches for 2 to 4 minutes, turning once, until deep golden brown and crisp. Drain on paper towels.
08 - Serve immediately while hot and crispy, accompanied by ranch dressing, chipotle mayo, or your preferred dipping sauce.