Place the lamb, onion, garlic, and chipotle peppers into the slow cooker.
Add the pinto beans, corn, and diced tomatoes with their juices.
Pour in the beef broth, then sprinkle the cumin, oregano, salt, and pepper over the top.
Stir everything together until the ingredients are evenly combined.
Cover and cook on low for 8 hours, until the lamb is fork-tender.
Ladle the stew into bowls and top each serving with chopped cilantro.
Serve with lime wedges on the side for squeezing.