Your butter should be soft for shortbread. This helps it mix with the other ingredients well, making it easier for you to make your shortbread cookies. u003cbr/u003eu003cbr/u003eYou should also chill the dough to harden your butter before you bake your shortbread cookies. This will help you achieve the best results! u003cbr/u003eu003cbr/u003eIf you are ever unsure what to do with your butter or dough, check the instructions on the recipe. These should be followed to ensure that your shortbread cookies are successful!