Meanwhile, mix together panko, ½ tsp garlic powder, half the sesame seeds, and a large pinch of salt on a plate. Pat pork dry with a paper towel, then season all over with salt and pepper. Brush pork with sour cream, coating evenly. Working one cutlet at a time, dip pork into panko mixture, coating all over and pressing to adhere. Set finished cutlets aside on another plate while you work with the rest.