Prepare cookies by mixing together butter and sugars with an electric mixer. Add in eggs and vanilla and mix until combined.
Add flour, hot chocolate mix and baking soda to wet ingredients. Mix until fully incorporated before folding in baking chips.
Refrigerate cookie dough for 1 hour.
Preheat oven to 350° and line baking sheet with parchment paper.
Place cookie scoops on baking sheet, 2-inches apart. Slightly flatten each cookie dough ball with back of cookie scoop. Bake for 10-11 minutes.
Add a few marshmallows to the tops of each cookie, while still hot. Immediately return to oven on broil, to toast marshmallows, or toast with a blowtorch (my favorite method).
When cookies are completely cooled, put a generous scoop of San Bernardo Italian Biscotti Ice Cream between two hot chocolate cookies, and slightly press together. Enjoy right away!