Add the diced onion, minced garlic, and diced red bell pepper to the slow cooker.
Stir in the drained pinto beans, frozen corn, and diced tomatoes with their juices.
Pour the vegetable broth over the vegetables and beans.
Add the cumin, chili powder, smoked paprika, salt, and black pepper. Stir everything until the spices are evenly distributed.
Cover and cook on low for 6 to 7 hours.
Taste and adjust salt if needed before serving.
Ladle into bowls and top each serving with chopped cilantro and a squeeze of lime.