HEAT oven to 425°F. Crumple 4 large sheets of foil to make 4 (3-inch) balls; place on baking sheet. Top each ball with 1 tortilla; spray with cooking spray. Bake 6 to 8 min. or until tortillas are golden brown. (Tortillas will drape over balls as they bake.)

MEANWHILE, brown meat with chili powder in large nonstick skillet. Stir in beans and salsa; cook until heated through, stirring occasionally.

FILL tortilla shells with salad greens, meat mixture, cheese and tomatoes. Drizzle with dressing.