1. Preheat Oven to 350 degrees
2. In a large bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla. Sift together the flour, cocoa, baking soda, and salt. Stir into the creamed mixture. Mix in the chocolate chips. Drop dough by teaspoonfuls onto ungreased cookie sheets.
3. Bake 8-9 minutes in the preheated oven. Cookies will be soft.
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