In a large mixing bowl combine flour, hot cocoa mix, salt, and baking soda and set aside.

In a separate mixing bowl cream together butter, granulated sugar, and brown sugar.

Add the eggs and vanilla and mix until combined.

Slowly add the dry ingredients to the bowl of wet ingredients.

Finally stir in white chocolate chips, dark chocolate chips, and marshmallows.

Chill the dough for 1 hour.

Preheat your oven to 350 degrees F. Line a 9x13 inch pan with aluminum foil.

Press the dough into the prepared pan.

Bake for 23-25 minutes or until the dough is slightly browned on the top but still soft.

Cool, cut, and serve.