Preheat oven to 350 degrees (F). Line a baking sheet with parchment paper.
Combine dry ingredients and then cut in butter. This is easy if you have a pastry cutter.
Add vanilla and egg and mix well.
You can chill the dough before rolling. It makes it easier and you can keep chilled until you are 'ready to roll'.
Roll out to about 1/4 inch thickness on a floured surface and cut into shapes.
Bake at 350 degrees for ten minutes. Remove and allow to cool on baking sheet for a few minutes then remove to a wire rack to cool completely.
If desired, make a thick mixture of confectioners' sugar with a little water. Place in a piping bag or a Ziplock bag and snip a small corner. Pipe the icing onto completely cooled oatcakes.
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