1. Roll out the chocolate and vanilla dough separately, into a rectangular-ish shape roughly the same size.  Stack the dough on top of each other (it does not matter which flavor is on top).
2. Use a knife to cut the dough into a rectangle, roughly 6 inches by 7 inches.
3. Lift the long edge of the dough up from the counter using a bench scraper or spatula.
4. Start to roll the dough away from you, carefully rolling both sides of the dough.
5. Roll the whole way and press the edge down to seal.
6. Wrap in plastic wrap and transfer to the refrigerator.
7. Allow the dough to chill for 30 minutes before slicing.

If Baking Cookies:

1. Preheat the oven to 350 and line a cookie sheet with parchment paper.
2. Slice cold cookie dough into 1/2 inch slices and place them on the baking sheet.  Bake for about 10 minutes or until the edges just begin to brown.