Heat the oil in a small frying pan/skillet on high until just smoking

While the oil is heating, crack the eggs in a small bowl

Add the fish sauce

Beat the eggs with a fork or a whisk

When the oil is hot, pour in the egg mixture. It should bubble up and brown very quickly (30-45 seconds).

Flip the omelet and brown the second side

Transfer the omelet to a plate and add sriracha

Saute the spinach in the residual oil left in the same pan for 1-2 minutes. Season as desired (I like garlic powder).

Transfer to the plate and serve.