Cut the tortillas into eighths and add to the eggs. Let sit 15 minutes. Cut the avocados in half from tip to stem, and remove the pit.
Using a paring knife, slice the flesh in each half from tip to stem in 1/2-inch slices without cutting through skin. Using a large spoon, scoop the flesh out of the skin in 1 piece.
Lay cut side down on each plate and fan out the slices. Cut the tomatoes into slices and lay slices next to the avocado.
Drizzle with lime juice and oil, and sprinkle with salt and pepper. Heat the butter in a large skillet over medium heat and add the onion, chili powder and cumin.
Cook, stirring occasionally, 5 minutes. Add meat; cook just until warmed.
Add the beaten eggs and tortillas and cook,
stirring, until eggs are cooked to desired doneness. Arrange a mound of eggs on
each plate next to the avocado and tomato. Garnish with some cilantro. Serve