Preheat the oven to 350 degrees F. Line baking sheets with parchment paper or cookie sheet.

Dry ingredients.  In a medium bowl combine flour, cocoa and salt. Place to the side.

Wet ingredients. In a large bowl, with a handheld mixer, beat butter on medium-high speed until smooth, about 1 minute. Add sugar and beat until creamed, about 2 minutes.  Add the egg yolk, milk, and vanilla extract, and beat on high speed until combined.  Make sure to scrape down the sides and make sure all is combined.

Add dry ingredients to the wet ingredients and mix on low speed until combined.

In a small bowl pour sprinkles for rolling.  Scoop out tablespoons of cookie dough and roll in sprinkles.  Place rolled dough on prepared baking sheet, separating 2 inches apart.

Bake cookies for 10-12 minutes.

Remove cookies from the oven and allow them to cool on the baking sheet for 5 minutes. Press the chocolate kisses into the center of each cookie. Transfer cookies to a wire rack to cool completely.