Prep the lettuce and veggies: Rinse and pat dry the lettuce leaves. Chop bell pepper, carrots, and scallions.
Set aside.
Make the teriyaki sauce: In a small bowl, whisk soy sauce, rice vinegar, honey, water, cornstarch, and sesame oil (if using). Add a pinch of red pepper flakes if you like heat.
Cook the chicken: Heat olive oil or spray a skillet over medium-high. Add the chicken and season lightly with salt and pepper.
Cook 5–7 minutes, stirring, until cooked through and lightly browned.
Add aromatics: Stir in garlic and ginger. Cook 30–60 seconds until fragrant, being careful not to burn.
Sauce it up: Pour in the teriyaki mixture. Stir and let it bubble for 1–2 minutes until thick and glossy.
If it gets too thick, splash in a bit of water.
Toss in veggies: Stir in chopped bell pepper, carrots, and half the scallions. Cook 1–2 minutes to warm through while keeping some crunch.
Assemble: Spoon the chicken mixture into lettuce leaves. Top with remaining scallions, sesame seeds, and a squeeze of lime if you like.
Serve: Enjoy immediately while the filling is warm and the lettuce is crisp.