1. Prepare the cookie dough

1. In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy (2–3 minutes).
2. Beat in the eggs, one at a time, then mix in the vanilla extract.
3. In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
4. Fold in the chocolate chips.

2. Chill the dough

• Cover the bowl with plastic wrap and refrigerate for at least 1 hour to allow the dough to firm up.

3. Preheat the oven

• Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.

4. Shape and bake the cookies

1. Scoop tablespoon-sized portions of dough and roll them into balls.
2. Place the dough balls on the prepared baking sheets, spacing them about 2 inches apart.
3. Bake for 8–9 minutes, or until the cookies are set around the edges but still soft in the center.

5. Add the marshmallows

1. Remove the cookies from the oven and quickly press a marshmallow half (cut-side down) into the center of each cookie.
2. Return the cookies to the oven and bake for an additional 2 minutes, or until the marshmallows are puffed and slightly golden.

6. Finish with melted chocolate

1. Drizzle the melted milk chocolate over the tops of the cookies.
2. Let the cookies cool on the baking sheets for 5 minutes, then transfer them to a wire rack to cool completely.