Pat your chicken thighs dry with paper towels and season generously with salt and pepper on both sides. This step ensures proper browning and prevents steam from building up during the sear.
Heat olive oil in a large skillet over medium-high heat until shimmering, then add chicken thighs skin-side down. Sear for 5-6 minutes without moving them, letting the skin become golden and crispy.
Flip the chicken thighs and cook the other side for 3-4 minutes until lightly golden. The skin-side will render fat that keeps the meat incredibly moist throughout cooking.
In a small bowl, whisk together honey, minced garlic, soy sauce, rice vinegar, ginger powder, and red pepper flakes. Pour this sticky honey garlic chicken thighs crowd-approved sauce directly over the browned thighs, reduce heat to medium, and simmer uncovered for 12-15 minutes.
While the sauce reduces, mix cornstarch and water in a small cup to create a slurry. Pour it into the skillet, stirring gently to coat all the chicken pieces evenly.
Continue simmering for 2-3 more minutes until the sauce thickens into a glossy, clingy coating. Drizzle with sesame oil and remove from heat.
Transfer the chicken thighs to a serving platter and pour all remaining sauce over top. Garnish with chopped green onions and sesame seeds for color and texture.