Step 1

Cream butter and sugar till smooth. Stir in flour and cornstarch till well combined.

Step 2

Cover or wrap in plastic wrap and chill for at least 30 minutes.

Step 3

Roll into 1" balls and place on ungreased cookie sheets. Bake at 325° for about 15-18 minutes.

Step 4

Cool completely on cooling racks, then frost with lemon cream cheese frosting.

Step 5

For frosting: Beat butter, cream cheese, and salt till smooth and creamy. Add lemon zest and enough powdered sugar to make a spreadable frosting. Frost the tops of the cookies.