Mix soft butter with sugar, soda, vanilla, eggs and flour.
Knead the dough and a tablespoon lay on a baking sheet covered with parchment.
Bake cookies at 180 degrees for about 10 minutes or until brown.
Fast cookies turn out to be very tender and just melt in your mouth, while shortbread and crumbly. Cooking it is really very simple and quick, the dough can be a little liquidy, to fix it, put it in the refrigerator for half an hour, then the oil will harden a little and the dough will be more convenient to use. If you wish, you can sprinkle the finished cookies with powdered sugar.