Preheat the oven to 375°F.
In a large mixing bowl, cream together butter, sugar and salt. Beat until light and fluffy. Add vanilla and eggs one at a time, continuously beating.
Gradually add flour and cocoa powder, beating until well incorporated.
Place dough in cookie press with desired disk. Press dough out onto an ungreased baking sheet.
Bake for 8 to 10 minutes or until the cookies are golden brown on the edges. Rotate baking sheet halfway through baking time.