Heat the olive oil in a large skillet over medium-high heat. Add the beef stew meat and brown it on all sides for even flavor. Transfer the beef to the slow cooker.
In the same skillet, cook the onion and garlic for 3 minutes until softened. Add them to the slow cooker along with the mushrooms.
Stir in the chipotle peppers, diced tomatoes, beef broth, cumin, oregano, salt, and black pepper.
Cover and cook on low for 8 hours until the beef is fork-tender.
Taste and adjust salt if needed. Serve hot with cilantro and lime wedges on the side.