Chop the onions and sun-dried tomatoes and sauté them in a high pan. Meanwhile, whisk the eggs, season with salt and pepper and fry in the pan over medium heat. When the egg is starting to set, add the sliced olives and cheese and put the pan in the oven. Leave in the oven for about 15 minutes, until the dough rises and the cheese slowly takes on color.
Serve on a plate, add the herbs to the frittata and enjoy.