Add lentils, pumpkin purée, onion, carrots, celery, and garlic to the slow cooker.
Pour in vegetable broth and stir everything to combine.
Add curry powder, cumin, paprika, salt, and pepper. Stir again.
Cover and cook on LOW for 6–7 hours or HIGH for 3–4 hours.
Once done, blend the soup with an immersion blender (or in batches).
Stir in the coconut milk and mix until smooth and creamy.
Taste and adjust seasoning if needed.
Serve hot with garnish if desired.
