Preheat oven to 350°F (~175°C).

In a medium or large frying pan, melt the butter.

Dust the skirt steak with the steak seasoning or salt and pepper.

When the butter is melted and bubbling, add the steak and leave it undisturbed for 5 minutes. Flip the steak and cook on the other side for an additional 5 minutes. Remove the meat from the pan and let it rest on a cutting board while you cook the vegetables.

Add the chopped peppers and onion to the hot frying pan with the steak drippings. Sautée until the onions become translucent and the peppers slightly charred. Turn off the heat.

Chop the meat into bite-sized pieces and add back in the pan with the cooked vegetables.

Scramble the 12 eggs together and pour over the beef and vegetable fajitas. Stir to evenly spread the eggs throughout the mixture.

Bake at 350 F for 30–35 minutes, or until the center is firm.

Let it cool for 5 minutes, cut, and then serve with the cilantro and a couple slices of avocado for each slice.

Store in a sealed container in the refrigerator for up to 5 days.