In the bowl of a stand mixer cream together the butter and confectioners sugar for a good 5 minutes. You want it very light and fluffy so don’t skimp on this part! Next add your eggs, one at a time, beating well after adding each egg. Beat in your vanilla extract. In another bowl, combine your flour and salt. Slowly add about ⅓ of the flour mixture to your creamed mixture and slowly mix it in. Add the next ⅓ and mix until combined. Finally, add the rest of the flour mixture and carefully mix it in, taking care to not over mix your batter.