That man Omar is a hoot..... he may cook a nice tortilla, but his knowledge of cooking science is severely lacking. Extra Virgin Olive oil used six times over! Extra Virgin Olive oil is best used for salads, not for frying. Never fry a Virgin. What will remain of the Extra Virgin taste? And of the quality? Nothing and worse. The amount - vast seas of oil were used at the time because there were no non-sticking pans, fortunately that problem no longer exists today.
Sliced potatoes straight from the frying pan do not soak up eggs. They do not soak up eggs because they are already soaked with all that oil. The mixture becomes creamy because the eggs begin to coagulate due to the temperature.
Two non-stick frying pans, one for the onions, one for the potaoes and a little oil for each will do the trick. Mix them with the eggs when they are ready, and cook a tortilla in each frying pan.