@purplespark: I make these pinwheel icebox cookies every year at Christmas time. It has become a fun tradition and my children love to help me make them.
You will need a cup of butter, a cup of granulated sugar, 2 eggs, 3 cups of flour, 1 tsp. vanilla, and 2 Tbsp. cocoa.
In a large bowl, cream together the butter and sugar. Add the eggs and vanilla. Beat until fluffy. Slowly, add the flour in. Once mixed well, divide the dough into two halves. In one half, add the cocoa.
Place each half between two sheets of waxed paper dusted with flour or powdered sugar. Roll each into a rectangle. Carefully layer the cocoa half on top of the regular half. Roll into a log starting at the long edge. Cut the log in half and wrap each part in plastic wrap and refrigerate for four hours.
Cut into ¼ inch slices and bake on a greased cookie sheet at 350 for 8-10 minutes.