Marinate: In a large bowl, combine the chicken thighs with all marinade ingredients. Massage well to ensure the condensed milk and aromatics coat every piece. Marinate for at least 30 minutes (or up to 24 hours in the fridge).
Boil the Noodles: Cook the rice vermicelli in boiling water for 9 minutes. Drain thoroughly in a colander and let them sit until completely dry. If they feel clumpy later, microwave for 30 seconds to refresh.
Air Fry: Place chicken in the air fryer basket (do not crowd!). Cook at 350°F for 12 minutes, flip, and cook for another 10 minutes.
The Blast: Increase the temperature to 385°F and cook for 2–3 more minutes until the edges are mahogany and charred.
Rest: Remove the chicken and let it rest for 5 minutes before slicing. This keeps the juices locked inside.
Assemble: Layer your bowl starting with a base of lettuce and sprouts, followed by the dry noodles, sliced chicken, and toppings (pickles, mint, peanuts, and scallion oil).
Serve: Pour the Nước Mắm Chấm over the bowl right before eating and toss well.