HEAT oven to 400°F.
PLACE tortillas in single layer on large baking sheet; spray with cooking spray. Bake 7 to 8 min. or until tortillas are crisp.
MEANWHILE, cook chicken in large nonstick skillet sprayed with cooking spray on medium-high heat 5 min. or until done. Add salsa and chili powder; cook until heated through, stirring occasionally. Remove from heat; stir in cheese.
SPOON chicken mixture onto tortillas; top with remaining ingredients.