Prep the chicken: Pat dry and season lightly with salt and pepper.
Cut into even bite-size pieces for quick, uniform cooking.
Whisk the sauce: In a bowl, combine coconut aminos or soy/tamari, sweetener, vinegar, broth, and a pinch of red pepper flakes if using. Set aside.
Sear the chicken: Heat 1 tablespoon oil in a large skillet over medium-high. Add half the chicken in a single layer.
Sear 3–4 minutes per side until browned and cooked through. Remove, then repeat with remaining chicken and oil.
Sauté aromatics: Reduce heat to medium. Add garlic and ginger to the skillet.
Cook 30–45 seconds until fragrant, stirring constantly.
Add the sauce: Pour in the sauce. Bring to a simmer for 2–3 minutes to meld flavors.
Thicken the teriyaki: Sprinkle in xanthan gum slowly while whisking, or stir in arrowroot slurry. Simmer 1–2 minutes until glossy. Don’t overdo the xanthan—a little goes a long way.
Return chicken to pan: Toss to coat evenly.
Finish with toasted sesame oil. Taste and adjust salt, sweetness, or vinegar as needed.
Cook the veggies: In a separate pan, sauté broccoli, bell pepper, and zucchini with a pinch of salt and pepper until crisp-tender, about 5–7 minutes. You can also steam the broccoli for a brighter green bite.
Assemble meal prep: Divide veggies into 4–5 containers.
Top with teriyaki chicken and extra sauce. Garnish with sesame seeds and green onions.
Cool, then store: Let everything cool slightly before sealing. Store as directed below.