Place the sweet potato cubes, black beans, onion, and red bell pepper in the slow cooker.
Add the minced garlic, cumin, smoked paprika, chili powder, salt, and black pepper.
Drizzle the olive oil over the mixture and stir until everything is evenly coated.
Cover and cook on low for 6 to 7 hours, until the sweet potatoes are fork-tender.
Stir the hash gently once more before serving.
Spoon into bowls and top with chopped cilantro.