Brown the sausage pieces in a skillet over medium heat for about 5 minutes, then transfer them to the slow cooker.
Add the sliced peppers, onions, and minced garlic to the slow cooker.
Stir in the drained white beans, crushed tomatoes, and chicken broth.
Sprinkle the Italian seasoning, salt, and black pepper over the top and give everything a gentle stir to combine.
Cover and cook on low for 6 to 7 hours until the vegetables are soft and the flavors have blended.