Flatten the chicken breasts to an even thickness using a meat mallet.
Season both sides of the chicken breasts with salt and pepper.
Set up a breading station with flour, beaten egg, and panko breadcrumbs.
Dredge each chicken breast in flour, shaking off excess.
Dip the floured chicken into the beaten egg, ensuring it’s fully coated.
Coat the chicken in panko breadcrumbs, pressing gently to adhere.
Heat vegetable oil in a skillet over medium heat until hot.
Carefully place the breaded chicken in the skillet and fry for 4-5 minutes on each side until golden brown.
Remove the chicken from the skillet and drain on paper towels.
Slice the chicken katsu and serve with tonkatsu sauce and green onions.