These thumbprint cookies are the ideal Christmas treat because they have a delectable filling. does not contain eggnog, but they taste like it. For the rum, you can use 1 tablespoon milk and 1/4 teaspoon rum extract.
Preheat the oven to 350 degrees F (175 degrees C).
In a medium bowl cream together 3/4 cup butter white sugar and brown sugar until smooth.
Beat in egg and vanilla.
Combine flour and salt; stir into the creamed mixture by hand to form a soft dough.
Roll dough into 1 inch balls and place balls 2 inches apart on ungreased cookie sheets.
Make an indention in the center of each cookie using your finger or thumb.
Bake in the preheated oven until edges are golden about 10 to 12 minutes.
Cool on the baking sheet briefly before removing to a wire rack to cool completely.