This easy dough can be used to make simple chocolate-flavored butter cookies, or it can be combined with plain butter cookie dough to make checkerboard, pinwheel, or marbled cookies.
In a food processor, combine the flour, sugar, cocoa powder, and salt and process for 15 seconds, or until well mixed. Add the butter and egg and process for about 20 seconds, or until the dough comes together in a lumpy mass. Remove the dough from the processor and shape into a sausage about I½ inches in diameter and about 15