Place bread into a bowl and drizzle with melted butter, mix well to coat.
In another bowl, whisk eggs, sugar, milk, nutmeg and vanilla together. In another bowl mash up 1 banana and add to custard, pour over the bread and allow to soak for 15 minutes. Dice up the other banana and fold into bread pudding mixture. Grease 6 (2 1/2-inch by 2?inch) tall ring mold and wrap the bottom with foil. Spoon bread pudding mixture into mold 1/2 way then press 1 chunk of chocolate into the center then continue to fill to the top. Bake in a 325 degree oven until it is set and brown, about 35 to 40 minutes. Serve with Dark Rum Creme Anglaise.
To a saucepan add milk, scrape vanilla bean seeds into milk and add the pod. Bring almost to a boil. Remove from heat and allow bean to infuse for 10 minutes, then remove the bean. In a bowl whisk egg yolks and sugar until thick and light in color, then temper with hot milk. Pour mixture back into the pot and gently stirring constantly with a wooden spoon until custard thickens slightly. Remove from heat and strain through a fine sieve into a bowl over ice. Stir in rum and cover tightly so skin does not form while it is cooling.