Whisk together the dry ingredients in a large bowl. Set aside
Beat together the butter and cocoa. Add the eggs and vanilla. Pour dry ingredients in and beat all together.
Measure approximately 1 T of the dough or use a small cookie scoop. Gently roll into a ball, then roll in the confectioners' sugar to coat. Place on cookie sheet 1/2" apart.
Bake for 12-13 minutes.
Cookies will stay fresh in air-tight container for several days. They also freeze very well.