01 - Pound chicken thighs to even 1/2-inch thickness. Season both sides generously with salt and pepper.
02 - Dredge each thigh in flour, shaking off excess. Dip in beaten egg mixed with milk, then press firmly into panko breadcrumbs to coat evenly.
03 - Heat 1/2 inch vegetable oil in skillet over medium heat until shimmering. Fry chicken 3-4 minutes per side until golden brown and internal temperature reaches 165°F. Drain on paper towels and slice into musubi-width strips.
04 - Whisk rice vinegar, sugar, and salt until dissolved. Gently fold into warm rice using cutting motion. Cool slightly until handleable.
05 - Whisk together tonkatsu sauce, soy sauce, and honey until smooth and fully incorporated.
06 - Place plastic wrap on work surface. Lay halved nori sheet shiny side down. With damp hands, press 1/4 cup seasoned rice into compact rectangle in nori center. Sprinkle with furikake if desired.
07 - Place chicken katsu slice over rice. Drizzle lightly with sauce. Add thin rice layer and press gently. Fold nori around filling, using plastic wrap to compress into tight block. Let rest 2-3 minutes for nori to seal. Repeat with remaining ingredients.