Heat a skillet over medium heat and brown the beef stew meat on all sides until lightly seared. Transfer the meat to the slow cooker.
Add the diced onion, minced garlic, drained pinto beans, and diced tomatoes to the slow cooker.
Pour in the beef broth, then stir in the chili powder, smoked paprika, ground cumin, salt, and black pepper.
Cover and cook on low for 7 to 8 hours until the beef is tender.
Stir the soup once more before serving to distribute the beans and meat evenly.