Preheat the oven to 170 C/340 F.
Cream butter for a minute then add the powdered sugar.
Add the vanilla or (rose) flavoring.
Next, add the flour and cornstarch - combine well until you form a dough.
Tip: if the dough is too dry add one or two tsp of water.
Divide dough into four and each into another four.
Continue to divide until you have 32 pieces.
Roll each piece of dough into a ball and flatten on the parm of your hand.
Gently dap the flat cookie into granulated sugar.
Place on a cookie sheet.
Bake for about 10 to 12 minutes.
Cool on a cookie rack completely before you store in a cookie jar.