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HEAT oven to 350°F.
SPRAY both sides of Tortillas with cooking spray, then place in a single layer on baking sheet. Bake 10 min. or until crisp and lightly browned.
COOK meat with Taco Seasoning Mix as directed on package.
SPREAD each tortilla with 1 Tbsp. Nacho Cheese Sauce; top with meat mixture and lettuce. Crumble 1 Taco Shell over each tostada; top with tomato, cheese and salsa.