Slice the chicken breast into very thin strips and season with black pepper.
Finely shred the green cabbage, thinly slice the celery on a diagonal, and thinly slice the yellow onion.
Heat the avocado oil in a large wok or non-stick skillet over medium-high heat.
Add the chicken strips to the pan and sear until they are golden brown and fully cooked through.
Remove the chicken from the pan and set it aside on a plate.
In the same pan, add the onion, celery, and cabbage, stir-frying for 2 to 3 minutes until the vegetables are tender-crisp.
Stir in the minced garlic and grated fresh ginger, cooking for about 30 seconds until the aromatics are fragrant.
Add the cooked chow mein noodles and the reserved chicken back into the pan.
Pour the liquid aminos and toasted sesame oil over the mixture, tossing everything together for 1 to 2 minutes until the noodles are well-coated and the dish is steaming hot.