• Preheat oven to 375 degrees.
• Combine the flour, baking soda, and salt in a medium size mixing bowl and set aside.
• In a large mixing bowl beat together the butter, sugar, egg, limoncello, and vanilla extract.
• Add the flour mixture to the butter/sugar mixture to form a soft dough.
• Roll the dough into small balls and flatten slightly. Place on ungreased cookie sheets.
• Place in the oven and bake for 10 minutes.

To add a Limoncello glaze:

• Combine the 3/4 cup powdered sugar and the 5 teaspoons of  limoncello in a small mixing bowl. The glaze consistency should be a little bit on the thin side.
• Spread a thin layer of the icing glaze on each cookie. Sprinkle with decorative sugar or a bit of lemon zest if desired.
• Note:  if you would like a thinner glaze that can be drizzled over the cookies, just add a bit more limoncello to the icing mixture until you have the desired consistency.