To a medium-sized bowl, add the nuts along with oil, salt, Kashmiri chili powder, and cumin powder. Mix them until all the nuts are evenly coated.
Line the air frying tray with parchment paper. Place the nuts on the parchment paper and spread them evenly.
Air fry at 325°F for 6 minutes till the nuts change color. Toss the nuts at the halfway mark for even browning. If using a toaster-style air fryer, make sure to rotate the tray.
Transfer the nuts to a baking tray and sprinkle chaat masala over it. Mix to combine well.