Prep the bok choy: Trim the very end of each bulb, keeping the heads intact.
Slice lengthwise. Rinse well, especially between the layers, and pat completely dry. Drying matters for good browning.
Season: Toss bok choy with the oil, salt, pepper, and garlic powder. Add red pepper flakes if you want heat.
Air fry: Preheat the air fryer to 380°F (193°C) for 3 minutes.
Arrange bok choy cut-side up in a single layer. Cook for 6–9 minutes, flipping halfway. Leaves should be crisp at the edges and stems tender-crisp.
Make the glaze: While the bok choy cooks, whisk soy sauce, honey, rice vinegar, sesame oil, ginger, and garlic in a small pan over medium heat.
If you want a thicker glaze, stir in the cornstarch slurry and simmer for 30–60 seconds until glossy.
Glaze and finish: Transfer the hot bok choy to a platter. Spoon the glaze over the tops, letting it seep between the leaves. Sprinkle with sesame seeds and scallions.
Add a squeeze of lime or lemon if you like brightness.
Serve: Enjoy immediately while the edges are still crisp. Pair with rice, noodles, or protein.