01 - Pat the chicken thighs dry with paper towels. Season both sides evenly with salt and black pepper.
02 - Heat vegetable oil in a large skillet over medium-high heat. Place the chicken thighs in the skillet and sear for 4 to 5 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Remove the chicken from the skillet and set aside on a plate.
03 - Reduce the heat to medium in the same skillet. Add the grated ginger and minced garlic, sautéing for about 30 seconds until fragrant.
04 - In a mixing bowl, whisk together the soy sauce, honey, rice vinegar, cornstarch, and water until smooth. Pour the mixture into the skillet, stirring constantly over medium heat until the glaze thickens, about 2 to 3 minutes. Stir in the crushed red pepper flakes if desired.
05 - Return the seared chicken thighs to the skillet, turning each piece to coat thoroughly in the thickened glaze. Simmer for 2 minutes to heat through and allow the flavors to meld.
06 - Transfer the chicken to a serving platter and spoon any remaining glaze from the skillet over the top. Sprinkle with sesame seeds and sliced green onions. Serve hot.