Arrange onions, fennel and garlic in bottom of slow cooker. Place beans on top of vegetables. Pour over chicken broth.
Season chicken all over with salt and pepper and place on top of vegetables and beans in the slow cooker. Sprinkle rosemary over chicken. Place roasted red pepper slices on top of chicken. Arrange Swiss chard all around chicken.
Cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours.
Slice bread and grill or toast, then drizzle with olive oil. Rub hot bread with garlic clove and serve with meal.