In 4-quart saucepan or Dutch oven, cook onion and garlic in oil until onion is tender. Add remaining ingredients except chicken. Bring to a boil. Reduce heat to low; cover. Simmer 40 minutes, stirring occasionally. Add cooked chicken; continue cooking 5 to 10 minutes or until chicken is heated through and barley is tender. Add additional water or chicken broth if chili becomes too thick upon standing. Nine 1-cup servings *NOTE: To use Quick QUAKER Barley, substitute 3/4 cup quick barley for medium barley and decrease water to 2 cups. Cook onion and garlic as directed above. Add remaining ingredients except chicken. Bring to a boil. Reduce heat to low; cover. Simmer 10 minutes, stirring occasionally. Add cooked chicken. Continue simmering 5 to 10 minutes or until chicken is heated through and barley is tender.