Beat the butter and sugar together with a mixer until fluffy.

Add the salt, vanilla extract, and flour until a dough forms.

Roll out the dough into a 1/4" disc on a well-floured piece of parchment, cut out your cookie shapes, and place them on a parchment-lined baking sheet.

Chill the cookies for at least 30 minutes.

Preheat the oven to 350 degrees F and bake the cookies for 10-13 minutes; let cool for about 5 minutes to harden.

If making sandwich cookies, heat up the chocolate chips in the microwave for 15-second increments, stirring in between, until melted.

Spoon the melted chocolate on half of the cookies to create the filling and place another cookie on top to make a sandwich.