Pat the chicken breasts dry with paper towels, then slice each one in half lengthwise to create thinner pieces. Place each piece between plastic wrap and pound to an even 1/2-inch thickness using a meat mallet—this ensures even cooking and a tender result. Set up three shallow bowls for breading: in the first bowl, whisk together flour, garlic powder, salt, and black pepper; in the second bowl, combine beaten eggs, soy sauce, toasted sesame oil, and hot sauce until well blended; in the third bowl, mix panko breadcrumbs with furikake until evenly distributed. Arrange these bowls in a line for efficient assembly-line breading.
Working with one piece at a time, coat the chicken thoroughly in the flour mixture, shaking off excess. Dip it into the egg mixture, letting excess drip off, then press it into the panko-furikake mixture, coating both sides evenly and pressing gently so the coating adheres. Place breaded chicken on a clean plate or parchment paper. I like to let the breaded chicken sit for 5-10 minutes before frying—this helps the coating stick better and creates a crispier crust.
While the chicken rests, combine ketchup, worcestershire sauce, brown sugar, sriracha, and ground ginger in a small bowl, stirring until the brown sugar dissolves completely and the sauce is smooth. Taste and adjust seasonings if needed—the sauce should balance sweet, savory, and a touch of heat. Set aside until ready to serve.
Heat canola oil to 350°F in a large skillet over medium-high heat. Once the oil reaches temperature, carefully place breaded chicken pieces into the hot oil, working in batches to avoid overcrowding the pan. Fry for 4-5 minutes on the first side until golden brown, then flip and fry for another 4-5 minutes until the second side is equally golden and the internal temperature reaches 165°F. Transfer cooked chicken to a paper towel-lined plate to drain excess oil.
Slice the fried chicken into strips. Divide steamed rice among serving plates and top with chicken strips. Drizzle the Hawaiian sauce from Step 3 over the chicken, then sprinkle with chopped chives. Serve with kimchi on the side for a bright, tangy contrast to the rich, crispy katsu. I find that a generous dollop of kimchi on each bite cuts through the fried richness perfectly.