Sweet Potato and Chipotle Soup

In a large Dutch oven or heavy pot,heat 1 tablespoon oil over medium-high.Add onion, season with salt andpepper, and cook until beginning tobrown around edges, about 7 minutes.Add cumin and garlic and cook, stirring,until fragrant, about 1 minute. Stirin sweet potatoes, chile, and broth.Bring to a boil; reduce to a rapid simmer,partially cover, and cook until sweetpotatoes can be mashed easily with aspoon, 20 to 25 minutes.

Let soup cool slightly. Working inbatches, transfer soup to a blenderand puree until smooth (use cautionwhen blending hot liquids). Returnpureed soup to pot over low heat andseason with salt and pepper. Topsoup with sour cream and serve withtortilla wedges, if desired.