Pat the chicken breasts dry with paper towels. Season both sides with salt and pepper. Pound to an even thickness if necessary.
Set up three shallow dishes: one with flour, one with beaten egg, and one with panko.
Dredge each chicken breast in flour, then dip into the beaten egg, and finally press into panko until well-coated.
Heat oil in a skillet over medium heat until shimmering. Fry chicken for 4–5 minutes on each side until golden brown.
Transfer fried chicken to a paper towel-lined plate to drain excess oil, and let it rest for 2–3 minutes.
Slice the chicken into strips and serve with katsu sauce, rice, and shredded cabbage, or in a sandwich.
