Preheat oven to 375 degrees and spray a 13x9-inch (3-quart) glass baking dish with cooking spray.
In large bowl, mix soup, sour cream, milk, chili powder, and cumin until blended.
Stir in chicken (cooked and shredded), tomatoes with chilies, 1/2 of tortillas (cut into strips), beans, corn, and bell pepper. Stir in 1/2 of the cheese. Spoon and spread mixture in baking dish.
Sprinkle with remaining tortilla strips (cut into strips).
Bake for 40 minutes. Sprinkle with remaining cheese and let stand 5 minutes.