Heat olive oil in a large pot over medium heat. Add onion and cook until softened, about 5 minutes.

Add garlic and cook for another minute until fragrant.

Peel and chop sweet potatoes. Add to the pot along with vegetable broth, salt, and pepper.

Bring to a boil, then reduce heat and simmer for 30-40 minutes, or until sweet potatoes are tender.

Add kale and cook until wilted, about 5-10 minutes.

Use an immersion blender or transfer to a regular blender to blend until smooth. (Be careful when blending hot liquids!)

Adjust seasoning to taste.