01 -
In a medium size bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
02 -
In a large bowl using an electric mixer fitted with the paddle attachment, beat together butter, brown sugar, and granulated sugar on medium speed until creamy, about 2 minutes.
03 -
Add egg and vanilla extract; mix on high until combined, about 1 minute. Scrape down the sides of the bowl as needed.
04 -
Add flour mixture to wet ingredients. Add milk and gel food coloring; mix on low speed until combined.
05 -
Cover and refrigerate dough for a minimum of two hours or up to three days.
06 -
Preheat oven to 350F degrees. Scoop dough into 1" rounds or use a #60 disher. Roll balls in granulated sugar and place 2" apart on lined baking sheet. Bake 11-13 minutes until edges are set.
07 -
Cool on baking sheet for 2-4 minutes, then press a Hershey's Kiss into each cookie. Transfer to wire rack to cool completely.