HEAT oven to 350ºF
LINE 8 muffin pan cups with tortillas. Carefully fold back edges of tortillas to leave openings in centers for the filling. Bake 10 min.
MEANWHILE, cook meat in large skillet with taco seasoning mix as directed on package.
MICROWAVE VELVEETA and milk in microwaveable bowl on HIGH 1 or 2 min. or until VELVEETA is completely melted and mixture is well blended, stirring every 30 sec.
TRANSFER tortillas to serving plates; fill with lettuce and meat mixture. Drizzle with VELVEETA sauce; top with tomatoes.