preheat over at around 190 °C

separate the eggs, put the egg yolks in a small bowl

add the salt in the egg whites

whisk the egg whites until it has a foamy tecture

Add the sugar gradually and whisk until the sugar is incorporated

Add the egg yolks and mix until is homogeneous

Add the oil and mix

Last add the flour stir carefully making sure not to leave any flour bubbles in the mixure

Optional : add some chocolate chips or cut small pieces of chocolate in the mix

Pour the mix into an pan covered in baking paper

Put it in the oven until the sides start to come off the sides of pan..Make sure to keep it a bit longer so it will be baked in the middle