In a medium bowl, whisk the egg white, mix in 1 tablespoon soy sauce, 1 tablespoon rice vinegar, and 1/2 teaspoon salt.
Add the chicken chunks to the mixture and toss to coat the chicken pieces.
Let the chicken stand while preparing the coating and sauce.
Coating
Using a second medium bowl, mix 1/2 cup cornstarch with 1/2 cup flour, 1/2 teaspoon baking powder and 1/2 teaspoon salt.
Prepare Sauce
Using a small bowl, whisk 3 tablespoons soy sauce with 1 tablespoon corn starch.
Mix in 3 tablespoons rice vinegar, 2 tablespoons brown sugar, and 1/2 cup chicken broth.
Fry chicken
Heat about 1 inch of oil in a deep, cast iron pot to 350 degrees F.
Take the chicken out of the marinade and add it to the cornstarch coating mix. There is need to worry about excess liquid. Toss it together to coat all of the chicken pieces.
Fry the chicken in small batches. Fry until the chicken is cooked through and is a light golden brown.
Transfer chicken to paper towels to drain.
Put it all together
Slice the green onions into 1/4 inch slices.
Using a wok or large saucepan, heat 3 tablespoons of oil over medium heat.
Add the dried chili peppers, garlic, ginger, and green onions to the wok and cook for a minute or two.
Add the sauce and bring mixture to a boil.
Add the chicken and coat with the sauce.
Remove from heat and serve with steamed broccoli and rice.