To prepare a teatime shortbread Bon Appetit baked goods recipe, first preheat the oven to 375?F (190?C) and grease and flour two 9 x 13-inch baking pans. Cream the butter and sugar with an electric mixer on medium speed until light and fluffy, about 2 minutes. Add the eggs and vanilla and beat until incorporated. Pour the dry ingredients into the wet ingredients and mix until just combined. Fold in the cranberries, walnuts and orange zest. Press the mixture evenly onto the prepared baking sheets. Bake for 20 to 25 minutes or until lightly browned. Allow to cool before removing from the pan.