Add just breadcrumbs (not the oil) to a frying pan over medium heat. Stirring almost constantly so they don't burn, toast the breadcrumbs. Once most of the crumbs are lightly browned, remove from heat and pour them into a shallow bowl. Add the oil over the breadcrumbs and mix.
Add the flour to one shallow bowl and a beaten egg to another shallow bowl.
Sprinkle both sides of the pork cutlets with salt and pepper.
Dredge all sides of a pork chop in flour, shaking off any excess. Then dip into egg, drip off that excess and lay in the breadcrumbs. I like to firmly press all sides of the pork chop to get it coated then flip over and do the same thing to the other side.
Repeat with all of the pork steaks.
Preheat the air fryer to 370°F for 5 minutes.
Make tonkatsu sauce while air fryer is heating. In a small bowl, mix together ketchup, oyster sauce, Worcestershire sauce, and brown sugar.
Place all four pork chops into the air fryer and cook for 3 minutes. Carefully flip over and cook for an additional 3-5 minutes until internal temperature is 145°F when checked with a digital thermometer.
Cut each pork cutlet into 3/4-inch slices and serve with sauce and shredded cabbage.