White chocolate chip cookies

1 cup butter, softened
2 cups white sugar
2 eggs
2 teaspoons vanilla extract
2 cups all-purpose flour
3/4 cup unsweetened cocoa powder
1 teaspoon baking soda
1/2 teaspoon salt
1 2/3 cups white chocolate chips

1.Preheat oven to 350 degrees F (175 degrees C).
2.In a large bowl, cream together the butter and sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla. Combine the flour, cocoa, baking soda and salt; stir into the creamed mixture. Fold in the white chocolate chips. Drop by rounded teaspoonfuls onto ungreased cookie sheets.
3.Bake for 8 to 10 minutes in the preheated oven, until cookies are set. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.