Grease oil (or ghee for more flavor) in a cast iron pan or you may use a cast iron skillet too(you may also use non stick pan but I recommend using cast iron pan for this recipe, as it helps make it more browned and delicious).
When the pan is hot, add one ladle full of batter to the cast iron pan, then gently spread the batter thinly by moving the ladle in circular motion.
Cook this for about a minute or two until the side starts to come off from the pan. You may add a teaspoon of oil or ghee while it is cooking, if you wish, which will make it more delicious and flavorful, but this is not necessary.
Gently flip the dosa using a good quality spatula, starting from the sides. In case the dosa is sticking towards the middle, you can cook it for another one more minute so that it will come off easily from the pan.
Cook the other side too for a minute until the other side is lightly browned.
Gently transfer the cooked dosa from the pan to the serving plate.
Similarly you can make all dosas until the batter is finished. Enjoy the hot dosa with chutney or sambar or any curry as you wish!