Gather Ingredients.
Toss chicken with 1 tablespoon cornstarch in a bowl.
Heat 1 tablespoon oil in a 12-inch skillet over medium-high heat. Add chicken; cook and stir until browned. Transfer to a plate using a slotted spoon.
Heat remaining 1 tablespoon oil in the same skillet. Add onion, garlic, and ginger; cook and stir until softened and fragrant, 1 to 3 minutes.
Whisk remaining 1 tablespoon cornstarch, soy sauce, chicken broth, bourbon, brown sugar, vinegar, and pepper flakes together in a small bowl.
Add soy sauce mixture to the skillet; cook and stir until thickened and bubbly.
Return chicken to the skillet; cook and stir until coated in sauce and heated through, about 2 minutes.
Serve chicken over rice; top with green onions.
