Prepare and weigh all ingredients. Let the butter soften in a bowl, then mash it together with the powdered sugar and a pinch of salt until well combined.

Add the flours and mix until a smooth dough forms. Divide the dough; add cocoa powder to the smaller portion and mix well. Chill the dough in the refrigerator for 10 minutes before shaping.

Prepare cookie molds, or you can use a container lid. First, use a little of the cocoa dough to form the outer 'bark' of the log, then add the yellow dough for the 'core.'

Draw lines on top to create a wood grain effect. Preheat the oven to 340°F (170°C) and bake for 30 minutes. Let the cookies cool completely before removing them from the tray, as they are fragile when hot.

Continue with other shapes. Soften the cream cheese. Whip the heavy cream, then mix it with the cream cheese until you get a thick, stable frosting. Divide into bowls and add food coloring. The main Christmas colors are red, green, and yellow.

Once the cookies are cool, decorate them as you like.