Prepare the batter: In a large mixing bowl, combine Jiffy cornbread mix, grated onion, buttermilk, beaten egg, panko bread crumbs, flour, salt, pepper, and baking powder. Stir gently until just combined — do not overmix. The key here is to work the ingredients just enough to bring them together; overmixing will develop too much gluten and make your hush puppies tough instead of tender.
Rest the batter: Cover and refrigerate the batter for at least 30 minutes to firm up and enhance flavor. This resting period is crucial as it allows the dry ingredients to fully hydrate and the flavors to meld together. The chilled batter will also hold its shape better when dropped into the hot oil.
Heat the oil: Heat 2–3 inches of oil in a deep pot or fryer to 350–375°F (175–190°C). The correct oil temperature is essential - too low and your hush puppies will absorb too much oil and become greasy; too high and they'll brown too quickly on the outside while remaining raw inside.
Fry the hush puppies: Use a small cookie scoop or spoon to drop batter into hot oil. Fry for 2–3 minutes, turning halfway, until golden brown and crispy. Work in batches to avoid overcrowding the pot, which would lower the oil temperature and result in soggy hush puppies.
Drain and serve: Remove with a slotted spoon and drain on paper towels. Serve immediately while hot and crunchy. The contrast between the crispy exterior and soft, cornbread-like interior is what makes hush puppies so delightful.