Heat the olive oil in a skillet over medium-high heat. Add the beef cubes in a single layer and brown on all sides for 4 to 5 minutes total.
Transfer the browned beef to the slow cooker. Add the onion, red bell peppers, celery, and garlic.
Stir in the chopped chipotle peppers, adobo sauce, smoked paprika, cumin, oregano, salt, and black pepper.
Pour the beef broth over the ingredients and stir once to combine.
Cover and cook on low for 8 hours until the beef is fork-tender.
Taste and adjust salt or pepper if needed before serving.