In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt. Set aside.

In a large bowl, beat the softened butter and 1 cup of granulated sugar with an electric mixer until light and fluffy, about 2-3 minutes. Beat in the egg, vanilla extract, and red food coloring until combined.

Gradually add the dry ingredients to the wet ingredients, mixing on low until just combined. Do not overmix. Cover and chill the dough for at least 1 hour.

Preheat oven to 375°F (190°C). Line baking sheets with parchment paper. Place extra granulated sugar in a shallow bowl.

Shape the chilled dough into 1-inch balls. Roll each ball in the sugar to coat and place 2 inches apart on the baking sheets. Bake for 8-10 minutes, until the edges are set.

Immediately after removing from the oven, press a Hershey's Kiss into the center of each cookie. Let cool on the baking sheet for 5 minutes before moving to a wire rack to cool completely.