-
Set oven rack to middle position.
-
Preheat oven to 275°F.
-
Have two ungreased 8-inch cake pans ready.
-
Food Processor Method.
-
Cut the butter into 1-inch cubes, wrap it, and refrigerate.
-
Process the sugars for 1 minute or so, until the sugar is very fine.
-
Add the butter and pulse until the sugar disappears.
-
Add the flour and pulse until there are a lot of moist, crumbly little pieces and no dry flour particles remain.
-
Dump the mixture into a plastic bag and press it together.
-
Remove the dough from the plastic bag and knead it lightly until it holds together.
-
Electric Mixer or by Hand.
-
Use superfine granulated sugar for the best texture and be sure to soften the butter.
-
In a medium bowl, whisk together the sugars.
-
In a large bowl, cream the butter with the sugars until light and fluffy.
-
With your fingers or with the electric mixer, mix in the flour until the mixture holds together.
-
If using the mixer, add the flour in 2 parts.
-
For Both Methods.
-
Divide the dough into 2 equal parts.
-
Pat each half into an ungreased 8-inch round cake pan.
-
Use the tines of a fork to press 3/4-inch lines radiating like rays of sun all around the perimeter of the dough.
-
Prick the rest of the dough all over with the tines of the fork.
-
(this keeps the shortbread even and creates the traditional design).
-
Bake for 60-70 minutes or until pale golden (do not brown).
-
For even baking, rotate the pans from top to bottom and front to back halfway through the baking period.
-
Cool in the pans, on a wire rack, for 10 minutes.
-
Invert the shortbread onto flat cookie sheet and slide it onto a cutting board.
-
While still warm, use a long sharp knife to cut each 8-inch round of shortbread into 8 pie-shaped wedges.
-
Transfer the wedges to wire racks to cool completely.