Heat oven to 400. Cut 2 tortillas into strips, toss with 1/2 tsp. oil. Spread in a single layer on baking sheet. Bake 10 to 12 min. or until crisp, stirring occasionally. Meanwhile, finely chop remaining 4 tortillas. Heat remaining oil in large saucepan on med. high heat. Add chicken, cook and stir 5 min. Add chopped tortillas, broth, salsa, and corn. Bring to a boil, simmer on med. low heat 15 min. Serve topped with cheese and tortilla strips.