Heat 1 tablespoon of oil in a large wok over high heat. Stir-fry the chicken with half the curry powder and a pinch of salt until browned and cooked through. Transfer to a plate.
Add the remaining oil, onion, garlic, and ginger. Stir-fry for 2 minutes, then add cabbage and carrot.
Stir-fry the kottu:
Push the vegetables aside and add the eggs. Scramble until just set, then add the chopped roti.
Pour in the curry sauce, add the chicken, remaining curry powder, and pepper flakes. Toss vigorously with two spatulas until hot and evenly coated.
Serve:
Taste for salt and spice. Serve immediately with lime wedges and extra sambal if desired.
Notes
Use a very hot pan so the roti fries rather than steams.
Paratha or another flaky flatbread can stand in for godhamba roti.
Add extra curry sauce a tablespoon at a time if the pan seems dry.