In a large mixing bowl, measure and add garlic powder, white pepper, baking soda, kosher salt and tamari (or an alternative listed above). Stir well to combine. It should foam up a bit.
Add in boneless skinless chicken breasts pieces. Toss well to combine and set off to the side for 10-15 minutes.
In a 12-inch skillet or large wok, add 1 tablespoon avocado oil. Heat on medium-high. Check to see if the oil is hot enough, by placing the end of a wooden chop stick (or end of a wooden spoon) in the oil. If bubbles surround it, it’s ready.
Once the oil is hot, immediately toss the chicken with the (1/4 cup) cornstarch.
Working in batches, arrange roughly a third of the chicken pieces in an even layer. Cook 4 to 6 minutes (or until a golden crust has formed) before using tongs to turn. Cook for an addition 4 minutes or so (or until fully cooked) before transferring the cooked chicken to a clean plate. Repeat with the remaining chicken pieces, adding more oil as needed.
Once all of the chicken is golden brown, reduce the heat to medium and allow the empty pan to cool a bit before pouring in the bourbon chicken sauce. Increase the heat to high and bring the sauce to a boil until it has thickened. This shouldn’t take long.
Once thickened, reduce the heat to medium-low and add the chicken back in and toss well to coat. Heat the chicken through about 1 minute.
Serve over hot rice with side of your choice and garnish with sliced green onions.