In a large pot, sauté the onion with ¼ cup of the vegetable broth over medium heat until soft and translucent. Stir in the salt, curry powder, garlic powder, turmeric, and black pepper.
Add the sweet potatoes, remaining vegetable broth, and coconut milk, and bring to a boil. Reduce the heat to medium and simmer for 20 minutes or until the sweet potatoes are soft.
Puree using a blender, food processor, or immersion blender. Serve and enjoy!