Yield 16-24 Servings
Preheat oven to 325 degrees. In large bowl, mix butter, sugar, vanilla and flour until combined-it will be crumbly but will stay together when formed into shapes. Divide dough into 4 equal balls. Form each ball into a log the length of the cookie sheet with a depression in the centre. They will be long and skinny, about 1 inch wide. Bake 12-15 minutes. When warm, fill with desired fillings. Mix powdered sugar and milk together to create a runny icing. Using a spoon, drizzle icing over filled shortbread logs. Cut on the diagonal into pieces once cooled.