Pat the chicken dry. Use paper towels to remove excess moisture so you get a solid sear. Season lightly with salt and black pepper.
Make the sauce. In a bowl, whisk soy sauce, honey, brown sugar, rice vinegar, sesame oil, garlic, ginger, chili-garlic sauce, water, and cornstarch until smooth. Set aside.
Sear the thighs. Heat a large skillet over medium-high.
Add oil. Sear chicken 4 to 5 minutes per side until browned. If using bone-in, you may need an extra minute per side.
Lower the heat. Reduce to medium.
If the pan is very greasy, spoon off a bit of fat, leaving about a teaspoon for flavor.
Add the sauce. Pour the sauce into the skillet. It will bubble. Turn the thighs to coat.
Simmer to thicken. Cook 5 to 8 minutes, turning occasionally, until the sauce becomes glossy and thick and the chicken reaches 165°F in the thickest part.
If it thickens too fast, add a splash of water.
Finish and garnish. Remove from heat. Sprinkle with sesame seeds and green onions. Let rest 2 minutes to set the glaze.
Serve. Spoon extra sauce over the chicken.
Pair with steamed rice, sautéed greens, or roasted veggies. Add lime wedges if you like a citrus pop.