Place steak on a plate and let come to room temperature (about 20 min).

Cover the top side of steak with 1 Tbsp taco seasoning mix.

Place canola oil in a 10” Cast iron skillet and heat over medium-high heat until very hot.

Place Beef steak seasoned side down in the pan.

Sprinkle remaining tablespoon of the taco seasoning mix on top of the steak.

Cook for 5 minutes.

Turn and cook another 5 minutes. (Add an additional 2 minutes if you like your steak well done).

Remove from pan and set on plate or cutting board to rest for 5 minutes.

Prepare your taco toppings.

Slice steak into strips, then into small bite-sized cubes.

Line soft taco shells with a few baby spinach leaves, then cheese, and steak. Top with Pico de gallo and avocado.