In a small saucepan over medium-high heat, whisk together 1 tablespoon sesame oil and 1 tablespoon cornstarch.
Stir in 1/2 cup soy sauce, 1/2 cup rice vinegar, 3/4 cup brown sugar, 6 cloves minced garlic, 1 teaspoon ground ginger, 1 teaspoon sesame seeds, and 1/2 teaspoon crushed red pepper flakes.
Bring to a simmer and cook until the sauce is thick.
Spray a baking sheet or 9x13 pan with nonstick cooking spray. Lay 8 chicken drumsticks out on the pan and brush with the barbecue sauce.
Bake in the 375 degree oven for about 45 minutes.
Garnish with 2 tablespoons sliced green onions and 1 teaspoon sesame seeds.