In a saucepan over medium heat, combine all of the sauce ingredients (except the cornstarch slurry). Bring it to a low boil.
Add the cornstarch to the sauce and whisk. Allow the sauce to thicken, then turn off the heat and let it cool for 10 minutes. Reserve half of the sauce.
Place the chunks of chicken in a bowl with the remaining sauce. Let it marinate for 15 minutes.
Thread 3 pieces of chicken onto each skewer, packing them together.
You can grill, bake, or air fry the skewers. Grill over high heat for 4 minutes per side. Bake or air fry at 400°F for 8-12 minutes. They are done when they reach an internal temperature of 165°F. Baste them with the reserved sauce as they cook.