Mix butter, powdered sugar, peppermint extract, and green food coloring together well.
Stir together flour and salt. Mix into butter mixture. Drop cookies from teaspoons onto ungreased baking sheets. Use your fingers to smooth tops of cookies, if desired. They look pretty with a more smoothly rounded top. Cookies do not spread.
2Bake for 8-9 minutes. While warm sprinkle cookies with a little powdered sugar, if desired.
NOTE: Using real butter and cake flour makes these cookies very tender and makes them melt in your mouth.