PREHEAT oven to 400F. Place 4 (4-oz.) custard cups, upside-down in shallow baking pan. Soften tortillas according to pkg. directions. Drape 1 tortilla over each cup. Spray each with vegetable cooking spray. Bake 10 min. or until edges are golden. Let cool.

SLICE beef into very thin strips. Toss beef with garlic powder.

HEAT oil in skillet. Add beef and stir-fry until browned and juices evaporate. Remove beef.

ADD picante sauce, dressing, onions and tomatoes. Heat to a boil. Return beef to skillet and heat through.

ARRANGE 1 cup salad greens in each tortilla cup. Spoon beef mixture over salad greens. Serves 4.

To make slicing easier, freeze beef 1 hr.