Tomato Tortilla Soup

Tomato Tortilla Soup
from Moosewood Simple Suppers

3 cups diced onions
2 teaspoons olive oil
2 teaspoons ground cumin
1 teaspoon dried oregano
1 quart vegetable broth
1 28-ounce can diced tomatoes
2 teaspoons minced canned chipotles in adobo sauce or more to taste
1 1/s cups crumbled corn tortilla chips
1) In a soup pot on medium high heat, cook the onions in the oil for 5 minutes or until softened. 2) Add the cumin and oregano and stir for a minute. Add the broth, tomatoes, and chipotles, cover, and bring to a boil. Reduce the heat and simmer for about 10 minutes.
3) Pulverize the tortilla chips in a blender. Add about 3 cups of the hot soup to the blender and puree until smooth. To make pouring easier, add another cup of hot soup and whirl on low speed. Stir the puree into the simmering soup pot. Serve hot.
Serves 4 to 6.