In 4- to 5-quart slow cooker, combine black beans, kidney beans, garbanzo beans, onion, red and green sweet peppers, chili powder, garlic, chipotle chile pepper, cumin, and salt. Add tomatoes and broth.
Cover and cook on low-heat setting for 8 to 10 hours or on high-heat setting for 4 to 5 hours. Stir in cilantro. If desired, serve bean mixture with rice. Makes 8 (1¼-cup) servings.
Tip: For Easy Cleanup: Line your slow cooker with a disposable slow cooker liner. Add ingredients as directed in recipe. Once your dish is finished cooking, spoon the food out of your slow cooker and simply dispose of the liner. Do not lift or transport the disposable liner with food inside.