In a food processor, combine 1/2 of the chiles, sour cream, and cilantro. Process until smooth. Set aside.
4 ounces diced green chiles,, 1/2 cup sour cream, 1/4 cup cilantro
Heat oil in a large pot. Add onion and remaining chiles. Saute for about 5 minutes or until onions are softened. Add cumin, chili powder, garlic powder and red pepper. Cook for 1 minutes or until fragrant.
1 small onion,, 1 teaspoon oil, 2 teaspoon cumin, 1/2 teaspoon chili powder, 1/2 teaspoon garlic powder, 1/4 teaspoon ground red pepper
Add remaining ingredients to the pot. Bring a boil. Reduce heat and simmer for 15 minutes, stirring occasionally. If soup is not smooth enough, use an immersion blender to make it smoother...this is totally optional!
1 can pumpkin puree, 14 ounces vegetable broth, 1/2 cup water
Swirl sour cream mixture into soup just before serving.