1Heat oil in a pan over medium heat. Add onion and garlic. Cover and cook 5 minutes or until tender.
2Place onion mixture in a 5-quart electric slow cooker. Add sweet potato and other ingredients. Cover and cook on low 8 hours or until vegetables are tender.
3Add peanut butter and stir well with a whisk. Use the hand blender and mix until smooth. Add pinch of salt and pepper.