Created on February 24th, 2012
Preheat oven to 375 degrees. Line two cookie sheets with parchment paper.
In a large mixing bowl, beat butter on medium-high speed for 30 seconds.
Add sugar, cocoa powder, baking soda, and salt. Beat until combined, scraping the sides of the bowl occasionally.
Beat in egg and vanilla until combined.
Beat in the flour.
Your dough should be at ball-rolling consistency at this point. If it's not, let it chill in the refrigerator for a while to firm up a little.
Once easily handled, roll dough into 1-inch balls.
If you want, roll the balls in sprinkles to coat.
Place balls 2 inches apart on your lined cookie sheets, and, using your thumb, make an indentation in the center of each cookie.
Bake for 7 to 8 minutes or until edges are firm. Immediately press a chocolate kiss into each cookie's center. Transfer to a wire rack and let cool.