Chewy Double Chocolate Chip Cookies Recipe

Cream the butter and sugar in an electric mixer until light and fluffy. Add the eggs and vanilla and beat well. Combine the flour, cocoa powder, baking soda, and salt. Add the flour mixture to the butter mixture gradually, beating until it is well incorporated. Stir in the chocolate chips and drop rounded teaspoonfuls onto an ungreased baking sheet. Bake in a preheated 350F oven for 8 to 9 minutes, until the cookies have puffed up (they will flatten as they cool). Cool slightly before removing to a wire rack to cool completely.