Prep the chicken: Pat chicken dry and slice thinly across the grain. Season lightly with salt and pepper.
This helps it brown and keeps it juicy.
Make the sauce: In a bowl, whisk 1/4 cup tamari or coconut aminos, 1 tablespoon rice vinegar, 1–2 teaspoons keto sweetener, 1 teaspoon red pepper flakes (optional), and 1 teaspoon toasted sesame oil. Taste and adjust salt, sweetness, and heat.
Heat the pan: Set a large skillet or wok over medium-high heat. Add 1 tablespoon avocado oil.
Sear the chicken: Add half the chicken in a single layer.
Cook 2–3 minutes per side until browned and cooked through. Transfer to a bowl and repeat with the remaining chicken, adding more oil if needed.
Sauté aromatics: Reduce heat to medium. Add a little oil if the pan looks dry.
Add minced garlic, ginger, and the white parts of the green onions. Stir 30–45 seconds until fragrant.
Cook the cabbage: Add shredded cabbage. Toss well to coat in the aromatics.
Cook 4–6 minutes, stirring often, until the cabbage is crisp-tender and slightly wilted. Season with a pinch of salt.
Combine and sauce: Return the chicken and any juices to the pan. Pour in the sauce.
Toss to coat and let it bubble for 1–2 minutes, allowing flavors to meld.
Finish and serve: Turn off the heat. Stir in the green onion tops and a drizzle of toasted sesame oil. Taste and adjust seasoning.
Garnish with sesame seeds if you like. Serve hot.