1. Start by preparing your onions. Separate them into rings and choose the larger ones for stuffing. Set aside the smaller rings for another use.
2. In a medium bowl, mix together the cream cheese, cheddar cheese, and chopped jalapeños until well combined. This filling should be smooth and easily spreadable.
3. Carefully stuff each large onion ring with the cheese mixture, pressing it down to fill the entire ring. Ensure the filling is level with the onion edges to prevent overflow during frying.
4. Set up a breading station with three shallow bowls: one with flour, one with beaten eggs, and one with panko breadcrumbs mixed with garlic powder, paprika, salt, and pepper.
5. Dredge each stuffed onion ring in flour, shaking off the excess. Dip it in the beaten eggs, then coat it evenly with the panko mixture. Press the breadcrumbs lightly to ensure they adhere well.
6. Heat vegetable oil in a deep pan to 350°F (175°C). Use enough oil to submerge the onion rings completely.
7. Fry the onion rings in batches for about 3-4 minutes on each side or until golden brown and crispy. Avoid overcrowding the pan to maintain the oil temperature.
8. Once fried, place the onion rings on a paper towel-lined plate to drain excess oil. Serve them hot for the best experience.

One tip I learned from my mother is to always taste the filling before stuffing the onions. Adjust the seasoning to your liking, as this is the heart of the dish.