Double Chocolate Chip Cookies

http://www.mybakingaddiction.com/2009/07/double-chocolate-chip-cookies.html

followed as written - well, except for measuring the chocolate chips

1/2 cup butter, softened
3/4 cup white sugar
1 egg
1 teaspoon vanilla extract
1 cup all-purpose flour
1/3 cup cocoa powder
1/4 teaspoon baking powder
1/4 teaspoon baking soda
1/8 teaspoon salt
1 cup semisweet chocolate chips

Method
1. Preheat oven to 350 degrees F.
2. In large bowl, beat butter, sugar, eggs, and vanilla until light and fluffy. Combine the flour, cocoa, baking soda, and salt; stir into the butter mixture until well blended. Mix in the chocolate chips. Drop by rounded teaspoonfuls onto ungreased cookie sheets.
3. Bake for 8 to 10 minutes in the preheated oven, or just until set. Cool slightly on the cookie sheets before transferring to wire racks to cool completely.