Add oil to pan. Add leeks and sweet pepper. Cook for 5 minutes or until tender, stirring occasionally. If desired, carefully add wine. Bring to boiling and cook until wine is nearly evaporated. Stir in beans, broth, thyme, salt and black pepper. Bring to boiling; reduce heat. Place chicken thighs on top of bean mixture. Simmer, covered, for 20 minutes or until chicken thighs are no longer pink (180 degrees F).