In a large bowl, cream together the butter, brown sugar, and granulated sugar until smooth. Beat in the vanilla and egg until well blended.
In a separate bowl, sift together the flour, cocoa powder, baking soda, and salt. Gradually blend the dry ingredients into the creamed mixture. Stir in the chocolate chips.
Drop by rounded teaspoonfuls onto ungreased cookie sheets.
Bake for 8 to 10 minutes in the preheated oven, until cookies are lightly browned.
Allow cookies to cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.
Interesting Facts
These chocolate cookies are a great treat for any occasion.
Adding a pinch of salt to the cookie dough helps to enhance the flavor of the cookies.
Semi-sweet chocolate chips can be substituted for milk chocolate chips for a different flavor.