PREHEAT oven to 350°F. Spray both sides of Tortillas with cooking spray; place in single layer on baking sheet. Bake 10 min. or until crisp and lightly browned.
MEANWHILE, cook rice in large saucepan as directed on package. Add beans, corn and Seasoning Mix; mix well. Cook 5 min. or until heated through, stirring occasionally.
TOP tortillas with rice mixture, lettuce, Salsa and cheese.