Season chicken with salt and pepper and toss with cornstarch until everything is well coated.
Heat the oil in a large skillet or wok and brown chicken for 6-7 minutes, until it is crispy and golden on the outside, but not cooked all the way through. Remove it from the pan and keep warm.
Meanwhile, mix together the garlic, ginger, chicken broth, brown sugar, bourbon, soy sauce, and vinegar until well blended.
Reduce the heat of the skillet to medium and pour in the sauce. Bring it to a boil and cook for 7-8 minutes, until it starts to reduce and thicken.
Add the chicken back to the pan and cook for 5-6 more minutes, until the chicken is cooked through and the sauce is nice and thick with a rich brown color.
Serve over rice and top with green onions and sesame seeds to serve.