1 - Preheat oven to 325F. Grease a 2 quart square baking dish; set aside. Place bun pieces on shallow baking sheets. bake 7 to 8 minutes or until dry and crisp; cool.
2 - In a medium bowl lightly beat eggs. Stir in sweetened condensed milk, 3/4 cup milk, vanilla, and nutmeg; set aside.
3 - Place bun pieces in prepared baking dish. Sprinkle with 1/2 cup each of the marshmallows and chocolate pieces. Evenly pour milk mixture over all. Let stand 5 minutes. Sprinkle with crushed graham crackers. Bake, uncovered, for 35 minutes. Sprinkle with 1/4 cup of the remaining marshmallows. Bake about 5 mintues more until a knife inserted near center comes out clean.
4 - For drizzle, in small saucepan heat and whisk remaining marshmallows, remaining chocolate pieces, and 2 tablespoons milk over low heat until melted and smooth. Drizzle over bread pudding. Cool 20 to 30 minutes before serving.
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