In a large bowl, cream together the butter and sugar until light and fluffy.

Beat in the egg, then stir in the vanilla.

Combine the flour and salt; stir into the sugar mixture.

Cover dough, and chill for at least one hour. Chill cookie sheets as well.

Preheat oven to 400 degrees F.

Scoop dough out onto chilled cookie sheets.

Bake for 13 to 15 minutes in the preheated oven, or until lightly golden at the edges.

Remove from cookie sheets to cool on wire racks.

Place cream cheese in a medium mixing bowl. Using a rubber spatula, soften cream cheese. Gradually add butter, and continue beating until smooth and well blended. Sift in confectioners' sugar, and continue beating until smooth. Add vanilla, and stir to combine.

Place the frosting in a piping bag or piping tool and frost cookies.

Serve and enjoy!