Heat a skillet over medium heat and add 1 teaspoon olive oil.
In a bowl, lightly beat the 4 eggs until blended.
Pour the eggs into the hot skillet and gently scramble until just set, about 2–4 minutes.
Warm or lightly toast the 8 corn tortillas if not already warmed.
Divide the scrambled eggs evenly among the tortillas, spooning them into the center of each.
Top each with diced avocado and sprinkle with the chopped cilantro.
Serve immediately, adding salsa or extra toppings if desired.