Crumble 4 sheets of foil to form 4 (2-inch) balls. Fold tortillas in half; place one foil ball inside each folded tortilla to resemble a taco shell. Place on two baking sheets. Bake 7 to 8 min. or until golden brown. Cool on baking sheets 5 min. or until taco shells are crisp. Remove and discard foil.