Heat your skillet over medium heat and add 2 tablespoons olive oil. Pour in egg mixture, swirl the pan so that the ingredients are evening distributed in the pan. Sprinkle the feta over the egg mixture. Lower the heat to medium-low and cook for about 5 minutes, until the edges are set and brown but it is still runny on top. Transfer skillet to the broiler and cook for another 2 to 3 minutes, until eggs are set on top.