HEAT oven to 400ºF.
PLACE tortillas in single layer on baking sheet; spray with cooking spray. Sprinkle with 1 tsp. chili powder. Bake 7 to 8 min. or until crisp.
MEANWHILE, brown meat with remaining chili powder in large skillet. Add beans and salsa; cook 4 min. or until heated through, stirring occasionally. Remove from heat. Stir in 1/4 cup cheese.
TOP tortillas with meat mixture, remaining cheese, lettuce, tomatoes and sour cream.
serving size = 1 tostada (195 g)
