Add pot roast, onions, peppers, garlic, chipotles, cumin, tomatoes, and chicken broth. Cover and cook for 6 hours or until pot roast is falling apart.
Pull pot roast with 2 forks to shred meat into chunks, and add meat back to slow cooker with beans. Adjust seasoning with salt and pepper. Continue cooking for 1 hour until beans and sauce are hot.
Display garnishes in bowls with slow cooker and allow guests to customize their chili.