What a cool idea.
This isn't the one I was going to share, but cranberries are in season at the moment, so here it is anyway.
When I bring cookies along to the party they really are what I have just been baking, most of the time
Cranberry Spice Squares
1 cup cranberries
1 tsp each soda, cinnamon, cloves, ground nutmeg
1 cup brown sugar
1 cup milk
2 cups plain flour
1/2 tsp salt
1/2 cup butter
Chop the cranberries coarsely. Sift the flour with the salt, soda and spices.
Cream butter and sugar together till light and fluffy, then add the egg. Add the flour in three parts alternately with the milk. Stir in the cranberries.
Bake in a greased 8" square pan at 350F / 170C for about an hour. Cool in the pan for ten minutes before turning out.
There's an optional frosting which I have tried but don't usually bother with - 3 oz cream cheese beaten till light, then beat in 2 tblsp cranberry sauce, then 3 1/2 cups icing/confectioners sugar.
This recipe comes from Boston Tea Parties - Recipes from the Museum of Fine Arts, Boston.