In a large skillet, heat 1 tablespoon of oil over medium-high heat. Add the fajita mix to the skillet and cook, stirring, until the vegetables soften, 5 to 7 minutes. Add the roast beef and cook for 3 minutes. Transfer the vegetables and roast beef to a plate.
Cook the eggs:
Heat the remaining 1 tablespoon of oil in the same skillet and scramble the eggs with a pinch of salt until cooked through.
Heat black beans:
Meanwhile, heat the black beans in a small saucepan over medium-low heat or in the microwave.
Serve:
Divide the beef and vegetable mixture among the tortillas, top them with scrambled eggs and black beans, and add some avocado and Cotija cheese. Garnish with cilantro and serve with the salsa.
Notes
Use the frozen, pre-sliced option or fresh fajita veggies. Can’t find fajita veggie mix? Slice 2 medium bell peppers and 1 small onion instead.