In a bowl, add soy sauce and cornstarch. Mix.
Add chicken pieces and toss to cover. Set aside and marinate for 15 - 20 minutes while you prepare the other ingredients.
In a small bowl, whisk together all sauce ingredients, soy sauce, hoisin sauce, oyster sauce, rice vinegar, honey, sesame oil and red pepper flakes. Set aside.
Add 1 tablespoon vegetable oil into a large skillet or wok. Place over medium-high heat.
When oil is hot and shimmering, add marinated chicken. Stir-fry until golden brown and cooked through, about 4 - 5 minutes.
Remove to a paper towel-covered plate to drain. Set aside and keep warm.
Add remaining tablespoon of oil to the skillet.
Toss in garlic, ginger, bell peppers, water chestnuts and green onions. Stir-fry for 3 - 4 minutes until the vegetables are tender but crisp.
Return chicken to skillet. Add almonds and cashews. Stir.
Pour prepared sauce over the top. Stir well to coat everything evenly. Cook for 2 - 3 minutes until the sauce thickens slightly.
Serve hot over steamed rice or noodles and enjoy this nutty, savory classic inspired by P.F. Chang’s!