Vegetable or corn oil, for drizzling, plus 2 tablespoons (2 turns of the pot in a slow stream).
Heat a grill pan to high and a soup pot to medium high. Drizzle oil on corn and place on grill. Add red pepper to grill with corn. Char vegetables 10 minutes, total, turning occasionally. Remove to cool, 5 minutes. Remove charred skin from the pepper.
While vegetables cook, dice chicken. Add 2 tablespoons oil to hot soup pot. Add chicken to pot. Season with poultry seasoning, cumin, salt and pepper. Lightly brown chicken on each side. Add onions and garlic and chipotle peppers. Cook vegetables with chicken 5 to 7 minutes to soften. Add tomatoes, tomato sauce and stock. Bring soup to a bubble, reduce heat to medium low.
Scrape corn off cob and add to soup. Chop grilled red pepper and stir into soup. Add chips to soup in handfuls and fold together.
Serve soup immediately with scatter of shredded cheese and a dollop of sour cream. Top with any or all of the suggested garnishes.