Heat a small skillet on medium and add the splash of olive oil. Fry the flour tortilla on both sides for about 20 seconds until just starting to brown but not crisp up too much. Set aside.
Mash the avocado into the tortilla and spread it around. Add a spritz of lemon juice (optional).
Sprinkle the feta into the skillet and add the chilli crisp. Break 1 or 2 eggs over the feta oil and cover with a lid. Cook to your preference.
The feta should be golden and crisp underneath the white of the egg sets.
Immediately remove and add it to the tortilla topped with smashed avo.