Chicken Tortilla Soup

1 med onion
3 garlic cloves (minced)
2 T oil
2 lbs chicken
28 oz can diced tomatoes
10 oz can diced tomatoes with green chilies
4 cups chicken broth
2 cups beef broth
1 can tomato soup ( progresso tomato with basil is really good)
1 T cumin
1 tsp chili powder

Cook First four ingredients until chicken is cook through . Add remaining ingredients and cook for 1 hour on medium heat. I like this soup a bit creamier so I also add a can of evaporated milk. At the end of the cooking time, I thicken the soup with flour and water or cornstarch and water.
Serve with baked tortillas cut into strips or tortilla chips, grated cheese and sour cream.