In a medium bowl, toss the chicken pieces with 1 tablespoon cornstarch and ¼ teaspoon black pepper to coat evenly.
Heat vegetable oil in a large skillet over medium-high heat. Add the chicken in a single layer and cook for 5 to 7 minutes, turning occasionally, until golden and cooked through. Remove from the skillet and set aside.
In a small bowl, whisk together the soy sauce, brown sugar, vinegar, bourbon, hoisin, garlic, and ginger.
Add the sauce mixture to the same skillet and bring to a simmer over medium heat.
In a separate small bowl, mix 1 tablespoon cornstarch with 2 tablespoons of water. Stir into the simmering sauce.
Cook for 2 to 3 minutes, stirring constantly, until the sauce thickens and becomes glossy.
Return cooked chicken to the skillet and stir to coat in the sauce. Cook for another 1 or 2 minutes until heated through.
Serve over rice and garnish with green onions and sesame seeds, if desired. Enjoy!