Flatten the chicken breasts to an even thickness using a meat mallet.
Season the chicken with salt and pepper on both sides.
Set up a breading station with flour, beaten eggs, and panko breadcrumbs.
Dredge chicken in flour, dip in eggs, and coat with panko.
Heat vegetable oil in a skillet over medium heat.
Add the breaded chicken to the skillet and fry until golden brown.
Remove from skillet and drain on paper towels.
Serve with tonkatsu sauce and cooked white rice.