Mix all the ingredients, except for 1 cup of fresh cranberries for the cranberry sauce together and cook on medium in a skillet until the cranberries have popped and the sauce has thickened. Fold in the remaining fresh cranberries.
Preheat the oven to 350 degrees F. Line a 9 x 13 baking pan with parchment paper.
Cream the butter and mix in the powdered sugar and beat well. Mix in the flour, baking powder, and salt and mix to combine.
Press the mixture into the baking pan, reserving a small portion of it to decorate the top if desired.
Prebake the shortbread for 15 minutes.
Pour the cranberry sauce mixture onto the shortbread and spread evenly. Cut out shapes with the reserved shortbread, if decorating.
Bake the cranberry mixture for 10 minutes, then add the decorative shortbread and bake for a further 9 - 10 minutes. Allow to cool completely before slicing into bars and topping with powdered sugar if desired. The icing mill from T-Sugars makes this an easy job.
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