Crispy, golden panko-breaded fish bites with tender, flaky fish inside. This easy fish katsu bites recipe is ready in just 30 minutes! I fry the fish in small batches to keep the oil hot, creating a beautifully crispy coating.
Dice the cod fillets into 1.5-inch bite-sized pieces. Pat dry thoroughly with paper towels and season both sides with salt, black pepper, and garlic powder.
Place the cornstarch in one shallow bowl, the beaten egg in a second bowl, and the panko breadcrumbs in a third bowl. Evenly coat each piece of fish in cornstarch, dip into the egg, then coat evenly with panko, gently pressing the breadcrumbs onto the fish. If there are bare spots, press on more panko. Transfer to a large plate or baking sheet in a single layer.
Heat 2 inches of vegetable oil in a large, heavy-bottomed pan over medium heat to 350°F (175°C). Use a cooking thermometer to check the temperature. Alternatively, insert a dry wooden chopstick into the oil. If small, steady bubbles form around the tip, the oil is ready for frying.
Fry the fish in small batches for about 2 minutes per side, turning as needed, until golden brown and cooked through to an internal temperature of 145°F (63°C). Avoid overcrowding the pan and let the oil return to 350°F between batches.
Remove the fried fish with a slotted spoon and transfer to a wire rack set over a baking sheet to drain excess oil and keep the coating crispy.
In a small bowl, mix the Japanese mayo and sriracha sauce until combined. Serve immediately with the crispy fish katsu bites.
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