Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt.
In a large bowl, beat the butter, granulated sugar, and brown sugar until light and fluffy. Add the egg and vanilla extract, and mix until combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Scoop the dough onto the prepared baking sheet, about 2 tablespoons per cookie, spacing them 2 inches apart.
Bake for 10-12 minutes, or until the edges are set.
Remove the cookies from the oven and immediately press a marshmallow half into the center of each cookie. Return to the oven and bake for an additional 2 minutes, or until the marshmallows are puffed.
Allow the cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
Drizzle the cooled cookies with chocolate ganache in a swirl pattern.
Prep Time: 20 minutes | Cooking Time: 14 minutes | Total Time: 34 minutes
Kcal: 180 kcal | Servings: 12 cookies
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