Place diced chicken in a bowl and cover with cold water. Add 1 teaspoon of baking soda, mix, and let the chicken sit while you are preparing the other ingredients.
Drain the water off the chicken chunks, use a paper towel to pat dry, then add the chicken back to your bowl. Sprinkle 2 tablespoons of cornstarch over the chicken and mix using tongs, then add the soy sauce, egg white, and pepper. Toss again until combined and the cornstarch mixture resembles a paste.
Heat a large skillet over medium high heat and add the avocado oil. Add the chicken to the hot pan leaving space between each piece of chicken, cooking in two batches if necessary. Cook for 3-4 minutes until the chicken is golden brown on the pan side, then use the tongs to flip the chicken and cook again until lightly golden brown. Once crispy and golden on all sides, transfer chicken to a paper towel lined plate.
In the same pan, add the onions and cook for about 2 minutes. Add the peppers and cook for another 2 minutes, or until the onions and peppers are slightly tender.
In a small bowl add the soy sauce, chicken broth, brown sugar, grated garlic, grated ginger, rice wine vinegar, sesame oil, and cornstarch. Whisk together until the cornstarch is dissolved, then add to the pan with the veggies and cook over medium until it comes to a boil. Once it boils, add the chicken and cashews, toss in the sauce, then remove from heat.
Serve immediately over prepared rice. Enjoy!