Heat the quart of heavy cream in a double boiler. Add 1/4 cup of the sugar. Whisk over heat till mixture reaches 150°. Add chocolate chips and continue whisking until chocolate melts.and keep on a low heat.
Place the nine yolks in a mixing bowl and add remaining sugar (1/4 cup). Whisk eggs and sugar together. Begin adding the cream/chocolate mixture ( a little at a time) into the egg yolks. Do not add all at once as you don't want scrambled eggs, do you? You really need to temper the eggs if you want a smooth custard. Continue adding until all ingredients are well incorporated.
Strain the mixture into another mixing bowl to make sure there are no bits of scrambled egg in the mixture. Refrigerate overnight. This extra time in the fridge ensures a creamy texture for the creme brulee.
After the mixture has chilled overnight, ladle into 5-oz ramekins, filling to just below the rim. Place in a 9x13 baking pan and fill the bottom of the pan with about an inch of hot water. The water will ensure a nice, even baking. Place the pan in a preheated 300° oven and bake for about an hour, until the custards are film on top. Remove the desserts from the oven, drain off the water and place in the refrigerator for six hours.
Remove from the fridge after the six-hour period and blot off any moisture that might have accumulated on the surface of the custards.
Coat the top of each with brown sugar and using a gourmet's torch, brown and caramelize the sugar on top. Add mini marshmallows and graham crackers. Using the torch one more time, toast the marshmallows and serve right away.