PREHEAT 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 one foil ball inside each folded tortilla to resemble taco shell. Place on two 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.