In a skillet over medium heat, cook bacon until crisp; drain. Return bacon to skillet; stir in onion, carrot and celery, cooking until onion is translucent.
In a large stockpot over medium heat, stir together bacon mixture, tomato sauce, diced tomatoes, chicken broth and beans until hot and bubbly. Stir in peanut butter and pepper until well combined. Serve immediately.