Over medium heat, add olive oil and minced garlic. Let garlic saute for just a minute then add chicken. Let chicken cook most of the way through. Pour in chicken stock and salsa. Raise heat to high and bring to a boil. Reduce heat back to medium and add tortellini. Let cook for about 8 minutes. Add corn and black beans. Let cook another 4-5 minutes. Scoop soup into bowls. Top each bowl with a dollop of sour cream, sprinkle cilantro over and pop in a few corn chips. Enjoy!!