4 ounces semi-sweet chocolate, cut into 1/2-inch squares
18 large marshmallows, cut in half
Chocolate shavings (optional)
In a small saucepan, melt together butter and chocolate chips over low heat. Stir until smooth and set aside.
In a large mixing bowl, beat together brown sugar and eggs. Add vanilla extract. Slowly incorporate flour, hot cocoa mix, baking powder, and salt. Mix in melted chocolate. Refrigerate cookie dough for 1 hour to solidify (you must do this!).
Preheat oven to 325 degree F (165 degrees C).
Using a spoon or cookie scoop, scoop cookie dough and spread out evenly onto a baking sheet. Bake for 12 minutes, or until cookie tops begin to crack. Pull cookies out from oven and place 1/2-inch chocolate square onto cut side of each marshmallow. Press one marshmallow half chocolate side down on top of each cookie. Bake cookies for an additional 4-5 minutes, or until marshmallows are softened. Sprinkle chocolate shavings on top, if desired.
Serve warm or room temperature, with a tall glass of milk. I like to heat up my cookies for 5-7 seconds in the microwave before eating just because I love a gooey, warm marshmallow.