Make sure the ground beef is thawed and ready to go. I typically freeze my ground beef, so this necessitates thawing it in the fridge overnight or by whatever method you prefer.
Spritz the cast iron pan with avocado oil and preheat. Should only take a minute or so.
Add thawed ground beef to pan and brown the meat, using a spatula to stir every minute or so. The meat should take less than 10 minutes to cook thoroughly.
While meat is cooking, wash and chop avocados and tomatoes.
Open can of black beans and rinse and drain.
Grate the extra sharp cheddar cheese.
After meat has finished cooking, serve buffet style, allowing everyone to layer their taco toppings in the shells. Eat and enjoy!