Pre-heat oven to 350°, line a large cookie sheet with parchment paper.
In a large bowl beat butter and sugar until creamy then add the egg and vanilla and beat to combine well. Divide mixture evenly into 2 bowls.
In one bowl add flour and corn starch (vanilla dough) combine with a fork until you have large crumbs then move to a flat surface and knead into a soft dough.
In the remaining bowl add the flour, corn starch and cocoa (cocoa dough) combine with a fork until you have large crumbs then move to a flat surface and knead into a soft dough. (if your house if very warm refrigerate 30 minutes).
Roll out the cocoa dough to a thickness of about 0.5 cm (thinner than the vanilla dough).
Roll out the vanilla dough to a thickness of about 1 cm.
Cut the vanilla dough into 4 strips all of the same width and length (about 1.5 cm, this is when I cut out forms), cut the cocoa dough in 3 strips, 2 strips the same size as the vanilla dough and 1 strip the same size as the combination of 2 vanilla and 1 cocoa strip. (see video)
On a flat surface, place one cocoa strip in between 2 vanilla strips, then place the single wide cocoa strip on top and top with one cocoa strip between 2 vanilla strips, (gently press the strips together to make sure they hold together).
Cut the form into approximately 3/4 inch slices, place slices (again gently press together) on their side on the prepared cookie sheet, make small triangles and balls with remaining cocoa dough and decorate. Bake for approximately 13-15 minutes. Let cool before serving. Enjoy!