After you cube the chicken, transfer it to a food storage container. Cover it with the buttermilk, and add the jalapeno, ginger, and garlic. Place in the refrigerator for 1 hour.
In the meantime, set up your dredging station with two bowls
Place the eggs and water in one bowl and beat with a fork
In the second bowl, mix the cornstarch, baking powder, flour, and salt. Mix well.
Drain the buttermilk from the chicken
Pat the pieces lightly with a paper towel
Coat each piece of chicken in the egg, followed by the flour mix (make sure every surface has flour).
Heat the frying oil to 350F
Fry the chicken in small batches so there’s plenty of room on all sides to reach the oil
Cook for 5 minutes per side until golden brown (you will need to flip the pieces midway for an even color).
Let them drain on paper towels to decrease the oil
Toss with sauce before serving