Add the chopped onion, red bell pepper, and minced garlic to the slow cooker.
Pour in the drained black beans, drained corn, and the can of diced tomatoes with green chilies.
Add the vegetable broth, chili powder, cumin, cayenne pepper, salt, and black pepper. Stir to combine everything evenly.
Cover and cook on low for 6 to 7 hours.
Stir in the lime juice right before serving.