Whisk orange juice, zest, soy sauce, brown sugar, vinegar, garlic, ginger, red pepper flakes, and sesame oil.
Pat chicken dry. Season both sides with salt and black pepper.
Heat oil in a large skillet over medium-high heat until shimmering.
Sear chicken thighs until golden on both sides, about 6–8 minutes total.
Pour in the orange sauce. Reduce heat to medium and simmer 6–8 minutes.
Stir cornstarch with water. Drizzle slurry into skillet while stirring.
Simmer until sauce is glossy and thick and chicken is cooked through.
Fold in green onions. Sprinkle with sesame seeds. Rest 2 minutes before serving.
Notes
Try swapping red pepper flakes with a squeeze of sriracha for smoother heat. Serve over steamed rice or with roasted broccoli to soak up the sauce. Leftovers keep well up to 3 days; reheat gently with a splash of water.This recipe is an original creation inspired by classic Spicy Orange Chicken Thighs Recipe flavors. All ingredient ratios and instructions are independently developed.