01 -
Preheat oven to 350°F and line a large baking sheet with parchment paper.
02 -
In a stand mixer, cream butter with both sugars until smooth. Beat in egg yolk, vanilla extract, and red food coloring until well combined.
03 -
Mix in flour, cocoa powder, baking powder, and salt just until the flour disappears and dough comes together.
04 -
Scoop out 18 equal-sized dough balls, roll between your palms, then coat each in red sanding sugar.
05 -
Bake for 10 minutes. Immediately press a chocolate kiss into the center of each hot cookie. Let cool on the baking sheet for 10 minutes before moving to a cooling rack.