Easy Fish Katsu Bites (30 Minutes)

Name: Easy Fish Katsu Bites (30 Minutes)
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Ingredients: 14 oz cod fillets (or use halibut or haddock fillets); 1 cup panko breadcrumbs ((add more if needed)); 1 large egg (beaten); 1/3 cup cornstarch ((add more if needed)); 3/4 tsp salt; 1/2 tsp black pepper; 3/4 tsp garlic powder; vegetable oil (or any neutral oil); 4 tbsp Japanese mayo (or regular mayo); 2 tbsp sriracha

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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.

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Ingredients & Substitutes
Expert Tips
Instructions
Storage & Reheating
Variations
Pairing Suggestions
FAQ
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📖 Recipe

Fish katsu is a Japanese-inspired dish featuring white fish coated in crispy panko breadcrumbs and fried until golden. It's commonly served as a fillet at Japanese restaurants, but my version uses bite-sized pieces that are easy to enjoy as a main dish, appetizer, or snack.

They're best enjoyed with creamy, spicy sriracha mayo or regular mayonnaise for dipping, but you can also pair it with steamed rice and vegetables to make it a complete meal.

I adapted this recipe from my popular chicken katsu because I wanted a lighter-tasting seafood alternative that the whole family could enjoy, including kids!

When I make these for lunch or dinner, I thoroughly pat the fish dry so the cornstarch coating adheres better. I also drain the fried fish on a wire rack to prevent the bottoms from becoming soggy.

Close-up of Japanese fish katsu bites with a crunchy, golden panko coating and tender white fish inside.

Ingredients & Substitutes

Exact ingredient measurements are in the recipe card below.

Cod Fillets: I recommend cod for its mild flavor and firm texture that holds up well when breaded and fried. Haddock or halibut also work. Use fresh or thawed frozen fillets. Avoid delicate fish that may fall apart during breading or frying.
Japanese Panko Breadcrumbs: Choose Japanese-imported panko with longer, larger flakes for a light, airy, extra-crispy coating. Regular breadcrumbs also work but produce a finer, denser crust.
Large Egg: Helps the panko breadcrumbs stick to the fish.
Cornstarch: Creates a dry base that helps the egg and panko coating adhere. Potato starch or all-purpose flour also work.
Salt and Black Pepper
Garlic Powder: Adds a subtle, savory garlic flavor to the fish. Avoid substituting with minced garlic, as it can burn in the hot oil.
Vegetable Oil: Or use another neutral oil with a high smoke point, such as canola or refined avocado oil. Avoid extra virgin olive oil, as its lower smoke point and distinct flavor make it less suitable for deep-frying.

Sriracha Mayo

Japanese Mayo: I prefer Kewpie because it's made with egg yolks instead of whole eggs, giving it a richer, creamier texture. Regular mayonnaise also works.
Sriracha Sauce: I prefer Huy Fong Sriracha for its classic garlicky flavor and spicy kick, but you can use any brand of sriracha you enjoy.

Note: Find the Asian ingredients at Asian grocery stores or in the international aisle of larger supermarkets.

Expert Tips

Cut the Fish Evenly: Cut the fish into similar-sized pieces so they cook evenly.
Pat the Fish Dry: Thoroughly pat the fish dry with paper towels so the cornstarch adheres better and the coating doesn't slip off.
Use a Heavy-Bottomed Pan: A heavy-bottomed pan retains heat better, helping maintain a consistent oil temperature for even frying.
Maintain the Oil Temperature: Keep the oil around 350°F (175°C) for a golden, crispy coating without excessive oil absorption.
Remove Browned Bits: Use a slotted spoon or fine-mesh strainer to remove loose, browned breadcrumbs between batches to prevent them from burning and sticking to the fish.
Drain on a Wire Rack: Transfer the fried fish to a wire rack instead of paper towels so excess oil can drain and the bottoms stay crispy.

Instructions

Here's how to make fish katsu bites:

Prepare the Fish: 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.
Bread the Fish: 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 the Oil: 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: 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.
Drain the Fish: 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.
Make the Sriracha Mayo: In a small bowl, mix the Japanese mayo and sriracha sauce until combined. Serve immediately with the crispy fish katsu bites.

Storage & Reheating

Refrigerator: Store leftover fish katsu bites in an airtight container in the fridge for up to 3-4 days. They are best enjoyed fresh for maximum crispiness.
Freezer: Once completely cooled, freeze the cooked fish katsu bites in a single layer on a baking sheet until solid. Transfer to a freezer-safe bag and freeze for up to 3 months.
Reheating: Reheat in an air fryer at 350°F for 5-7 minutes or in a preheated oven at 375°F for 8-10 minutes until heated through and crispy. If frozen, reheat directly from frozen at the same temperatures, adding a few extra minutes as needed until heated through and crispy.

Variations

Gluten-Free: Use gluten-free panko breadcrumbs and ensure the other ingredients, including the sriracha sauce, are certified gluten-free if needed.
Make It Mild: Serve with regular Japanese mayo instead of sriracha mayo for a kid-friendly dipping sauce.

Pairing Suggestions

Serve fish katsu bites with:

Chicken Karaage: Crispy Japanese fried chicken with a juicy, tender center.
Potato Salad: A creamy, comforting side dish that pairs well with crispy fish.
Spicy Asian Cucumber Salad: A refreshing, crunchy side with a spicy kick that balances the richness of the fried fish.

FAQ

Can I air fry fish katsu bites instead?

Yes! Preheat the air fryer to 370°F (188°C) and lightly spray the basket with oil. Arrange the breaded fish in a single layer, leaving space between each piece, and lightly spray the fish with oil. Air fry for 3-4 minutes, then gently flip and air fry for another 2-3 minutes until golden and crispy, with an internal temperature of 145°F (63°C). Cook in batches if needed.

How do I prevent the breading from falling off?

Pat the fish dry before coating, shake off excess cornstarch, and gently press the panko onto each piece. Avoid moving the fish too much while frying so the coating can set.

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