In a medium bowl, sift the flour and cocoa powder. Add baking soda, baking powder, and salt. Set aside.
1 ⅓ cup All-purpose flour, ¼ teaspoon Baking soda, ¼ teaspoon Baking powder, ½ cup Unsweetened cocoa powder, ½ teaspoon Salt
In a large bowl, add the melted butter (it needs to be cooled to room temperature), brown sugar, white sugar, vanilla, egg and egg yolk.
½ cup Unsalted butter, ¾ cup Brown sugar, ¼ cup White granulated sugar, 2 teaspoon Pure vanilla extract, 1 Large egg, 1 Egg yolk
Add the dry ingredients and use a rubber spatula to mix until just combined.
Preheat the oven to 350°F. Line two cookie sheets with parchment paper. Let the dough sit while the oven preheats. This allows the gluten to absorb into the wet ingredients.
Use a 1 tablespoon cookie scoop and scoop the cookie dough. Scoop 12 cookie doughballs per cookie sheet. Take the 18 marshmallows and cut them horizontally, I used kitchen scissors. Set aside.
9 Marshmallows
Bake one cookie sheet at a time. Bake for 6 minutes. Top each cookie in the middle with a marshmallow bake for another 2-3 minutes. OPTIONAL: if the cookies are uneven scoot the cookies with a biscuit cutter so they are perfect circles.
Let the cookies sit on the hot pan for 2 minutes before transferring to a cooling rack. Once they are on the cooling rack top them with Hershey's Kisses. Once cool it can be served.
18 Hershey's Kisses Hot Cocoa Chocolates