Cream the butter and sugar together until light and fluffy.
Add in egg and vanilla. Mix until well-incorporated.
Add in flour and salt gradually, mixing as you go, until everything is well-incorporated.
Shape your finished cookie dough into a disk. Wrap in plastic wrap and chill in the fridge for at least one hour, or the freezer for 30 minutes.
Preheat your oven to 350°F when just about ready to start baking. Line some cookie sheets with parchment paper.
Removed chilled dough from the fridge and roll out to about 1/4 inch thick on a lightly floured surface.
Cut out your Christmas lights and place them on the lined baking sheets. You don't need to leave much room for spreading.
Bake your cookies for 8-10 minutes, or until they start to look golden on the bottom side touching the cookie sheet.
Allow cookies to cool completely before decorating. Please see notes above about my easy method for decorating.
Enjoy these cookies with a glass of milk, coffee or just on their own!
