Heat the olive oil in a large skillet over medium heat. Add diced chicken thighs and cook for about 5-7 minutes, stirring occasionally, until the chicken is cooked through and golden brown.
Add minced ginger and garlic to the skillet. Sauté for about 1 minute until fragrant.
Pour in the teriyaki sauce, mixing well to coat the chicken. Let it simmer for another 2-3 minutes until the sauce thickens slightly.
Stir in the diced bell pepper, shredded carrots, and diced water chestnuts. Continue to cook for an additional 3-4 minutes until the vegetables are tender but still crisp.
Remove from heat and mix in the sliced green onions, reserving some for garnish.
To serve, spoon the teriyaki chicken mixture into the center of each lettuce leaf, creating a cup shape.
Garnish with sesame seeds and the reserved green onions before serving.
Notes
Use low-sodium teriyaki sauce for a healthier option.