While the soup is simmering, prepare the tortilla strips. Preheat the oven to 375ºF. Cut corn tortillas in half, then into about six thin strips. Lay in a single layer on a baking sheet and spray lightly with cooking spray. Sprinkle to taste with salt and chili powder. Bake 10-15 minutes until crisp and lightly browned, watching carefully so the strips don’t burn.