Make the sauce: In a small bowl, whisk soy sauce, rice vinegar, hoisin, sriracha, sesame oil, and honey. Taste and adjust heat or sweetness.
Set aside.
Prep the produce: Dice onion and bell pepper, chop mushrooms, mince garlic and ginger, shred carrots, and slice green onions. Keep the green tops for garnish.
Cook the aromatics: Heat oil in a large skillet over medium heat. Add onion and cook 2–3 minutes until softened.
Stir in garlic and ginger for 30 seconds until fragrant.
Brown the chicken: Add ground chicken, breaking it up with a spatula. Cook 5–7 minutes until no longer pink and lightly browned. If there’s excess liquid, simmer it off.
Add the veggies: Stir in bell pepper, mushrooms, and carrots.
Cook 3–4 minutes until just tender but still crisp. Add most of the green onions and stir.
Sauce it up: Pour the sauce over the mixture. Stir and cook 1–2 minutes to coat and thicken slightly.
Taste and add a pinch of salt or more soy if needed.
Assemble: Spoon the chicken mixture into lettuce leaves. Top with cilantro, sesame seeds, remaining green onions, and a squeeze of lime. Add a spoon of cauliflower rice or regular rice if you want more substance.