Mix beef with onion, cheese and Old El Paso® Spice Mix for Tacos, then divide mixture into 6 even-sized balls and flatten to form thin burgers. Cook on a BBQ or in a non-stick pan over a medium heat for 4-5 minutes per side until thoroughly cooked through.
Warm the crunchy Taco Shells by following the instructions on the box.
Fill each Taco Shell with half a burger, crispy shredded lettuce, juicy diced tomatoes and salsa and then crunch away!