Brown the sausage pieces in a large skillet over medium heat until lightly colored on all sides. Drain any excess fat and transfer the sausage to the slow cooker.
Add the sliced bell peppers, onion, and minced garlic to the slow cooker.
Pour in the crushed tomatoes and beef broth.
Sprinkle the oregano, basil, salt, and black pepper over the top.
Stir everything gently to combine.
Cover and cook on low for 6 to 7 hours until the peppers are soft and the flavors have blended.
Taste and adjust salt or pepper if needed before serving.