Line a baking sheet that will fit in your freezer with foil. Place 8 graham cracker squares on the baking sheet. Place 10 mini marshmallows on each square. Place under the broiler and watch carefully until the marshmallows become golden brown. Remove from the broiler and cool. Remove the ice cream from the freezer and let it soften a bit to make it easier to scoop. Place one scoop of ice cream on each cracker that has the toasted marshmallows on them. Top each scoop with the top cracker. Place in the freezer until the sandwich is frozen and firm. After the sandwiches are frozen - combine the chocolate chips and cream in a microwaveable dish that is large enough to dip the sandwiches in. I used a 2 cup Pyrex measuring cup. Microwave for 30 seconds, stir, microwave for 15 seconds and stir until thick and smooth. Cool slightly. Assembly - have everything prepared because you will need to work quickly. Quickly dip each sandwich in the chocolate ganache, sprinkle with toppings if desired, place on the baking sheet. Return the baking sheet in the freezer. Freeze several hours until hard. Wrap each sandwich individually.