HEAT oven to 425°F.
COOK meat with Taco Seasoning Mix as directed on package.
MEANWHILE, crumble 10 sheets of foil to form 10 (2-inch) balls. Fold Tortillas in half; place 1 foil ball inside each folded tortilla to resemble taco shell. Place on 2 baking sheets. Bake 7 to 8 min. or until golden brown. Cool on baking sheets 5 min. or taco shells are crisp. Remove and discard foil.
SPOON meat mixture into shells; top with remaining ingredients.