Add the diced onion, minced garlic, cubed sweet potato, and chopped red bell pepper to the slow cooker.
Stir in the curry powder and cumin until the vegetables are coated.
Pour in the drained chickpeas, diced tomatoes with their juice, coconut milk, and vegetable broth.
Season with salt and pepper, then stir everything together.
Cover and cook on low for 6 to 7 hours or on high for 3 to 4 hours until the sweet potato is tender.
Taste and adjust salt if needed before serving.
Spoon the stew over cooked rice and top with chopped cilantro.