Speedy Tortilla Soup

Heat oil in a 4-quart saucepan over medium-high heat. Saute onion, garlic, and parsley in hot oil until slightly browned, about 5 minutes. Add chicken and stir until well heated, about 2 minutes.

Pour chicken broth into the saucepan; bring to a boil. Stir in corn, diced tomatoes, and taco seasoning. Reduce heat, cover, and simmer for 5 minutes. Uncover and stir in tostada chip pieces. Remove from heat and ladle into bowls.

Garnish bowls with Cheddar cheese and dollops of sour cream.