Heat oil in the large skillet. Add onion, pepper and garlic, saute until barely tender. Add chicken, rice, soy sauce, broth, ginger and red pepper flakes. Cook and stir until heated through about 5 minutes.
Stir in peanuts. Transfer to serving bowl. Wash lettuce and pull off leaves, keeping them as intact as possible. Put leaves in another bowl.
To serve, have each person spoon some of the hot rice mixture onto a lettuce leaf and wrap like a taco. Wrapped leaves may be dipped in sauce.