Add ground chicken to a nonstick skillet over medium heat. Allow to cook until there is no pink color and chicken is cooked through. Drain off any fat and place chicken in a bowl while preparing other ingredients.
Add to the same skillet the toasted sesame oil, ginger, bell pepper, and (optional) bean sprouts. Cook on medium-low for 5 more minutes, stirring occasionally.
Add garlic and cook for one minute more. Return chicken to skillet and add lite soy sauce. Cook for an additional 1-2 minutes or until chicken is heated through.
Fill each of the lettuce cups with an even amount of the meat mixture. Top with fresh scallions and enjoy!