Get two shallow bowls. Mix the cornstarch, white pepper, and kosher salt in one bowl. Beat the egg in the other bowl.
Dip the chicken pieces into the egg, shaking off any excess, and then dredge them in the starch mixture. Transfer the coated chicken pieces to a plate and continue with this process until all the chicken is coated.
Heat a large skillet or frying pan over medium heat with enough oil to cover the bottom of the pan. Cook the chicken for a few minutes on each side until golden brown, crispy, and cooked through to an internal temp of 165ºF/74ºC. Transfer the cooked pieces to a wire rack and continue with this process until you’ve cooked all the chicken.
Heat the avocado oil in a small saucepan over medium heat. Once hot, add garlic, ginger, and red chili flakes. Stir for 1 minute until fragrant.
Add in the coconut aminos, chicken broth or water, tomato paste, rice vinegar, honey, and toasted sesame oil. Whisk together until combined and reduce the heat to medium-low.
Make the slurry by adding the starch to a small bowl with the cold water. Whisk until the starch has completely dissolved. Stir in the cornstarch slurry and continuously whisk until the sauce has thickened about 1-2 minutes.
Turn off the heat and add the cooked chicken pieces to the sauce mixture. Toss to coat in the sauce. Serve with rice, chopped green onions, and toasted sesame seeds.