Preheat oven to 350 degrees F. Make glaze: Whisk together soy sauce, garlic, honey, lime juice, Sriracha, one tablespoon sesame oil, and cornstarch in a medium bowl.
Season chicken with salt and pepper. Heat oil in an ovenproof skillet over medium-high heat. Sear chicken and let cook until golden, for 4 minutes, then flip and let cook for 4 minutes more. Pour over glaze then transfer to oven.
Bake until chicken is cooked through for about 25 minutes. Heat broiler.
Spoon glaze over chicken and broil for 2 minutes. Garnish with scallions and sesame seeds.