To make the tonkatsu sauce, place the ketchup, worcestershire sauce, soy sauce, brown sugar and garlic powder in a small bowl. Mix to combine.

Slice the chicken breasts in half and pound to 1/2-inch thickness, so that you have 4 chicken pieces. Season with salt and pepper on both sides. Place on a plate.

Place the flour, eggs and panko breadcrumbs in 3 separate shallow bowls. Dredge the chicken first in the flour, covering all sides, and shaking off any excess.

Then dip the flour covered chicken in the beaten eggs, letting any excess drip off.

Finally, place the chicken in the panko breadcrumbs, making sure that the chicken is fully covered. Press the breadcrumbs into the chicken if need be.

Spray the air fryer basket with cooking oil. Place the chicken in the air fryer basket in a single layer. Cook in batches if need be. Spray the top of the chicken with additional cooking oil.

Air fry at 350°F/180°F for 18 minutes, or until the internal temperature of the chicken reaches 165°F74°C, flipping and spraying the top of the chicken with more cooking oil halfway through.

Slice the chicken and top with tonkatsu sauce. Serve with rice and shredded cabbage, if desired.