Whisk eggs and milk together in a bowl until well combined.

Heat butter in a skillet over medium heat until foamy. Pour in egg mixture and reduce heat to medium-low.

As eggs begin to set, gently move your spatula across the bottom and sides of the skillet, creating soft, pillowy curds. Cook until eggs are just set but still slightly wet.

While eggs are cooking, warm your tortillas in a separate pan or over a gas flame until slightly charred.

Spoon eggs onto warm tortillas, top with cheese, avocado slices, green onions, cilantro, and salsa.