Optional veggies toppings: diced tomato, fresh corn kernels, diced red/yellow bell pepper, sauteed mushrooms, onions, or asparagus
Preheat an air fryer to 350F. Place the bacon slices in the air fryer basket and cook for 6 minutes, flipping halfway through. The bacon should be crispy all over. If you don't have an air fryer, cook the bacon with whatever your preferred method is.
In a small bowl, whisk together the eggs, milk, soy sauce, and red pepper flakes.
Melt the butter in a large skillet over medium heat. Add the eggs and reduce the heat to medium-low. Cook for about 30 seconds, until the edges are set, then sprinkle with the cheese. Continue to cook, stirring gently, until just set.
Place the tortillas on a large cutting board or plates. Thinly slice half an avocado over each tortilla, and sprinkle with salt and pepper.
Divide the eggs between the tortillas, then top with the bacon slices. If using veggies, add them on top. Fold closed.
If you like, sear the burritos in the empty skillet over medium heat for 1-2 minutes per side, until crisp and golden.
Store in an airtight container in the fridge for up to 3 days, then reheat in the microwave or in the oven. Keep in the freezer for up to 2 months, wrapped in aluminum foil. Reheat without thawing in the oven (with the aluminum foil) or in the microwave (without the aluminum foil).