Real Scottish Shortbread

Directions

1. 1
   Sift cornstarch, sugar and flour together.
2. 2
   Blend in butter until combined and then use hands to knead into a soft dough.
3. 3
   Shape dough into a ball, cover with plastic wrap and refrigerate for 30 minutes.
4. 4
   Place dough in the bottom of a greased 9x9-inch pan and bake at 300°F for 15-20 minutes or until lightly browned.
5. 5
   Cool completely in pan and cut into squares.
6. 6
   Store in an airtight container.