Preheat the oven to 360°F (182°C). Remove the crust from the bread and soak it in the heated milk and cream. Beat the mixture by hand or in a mixer until the pieces of bread are reduced to the size you want. Melt the chocolate and butter in a double boiler and add that into the bread mixture.
In a separate mixing bowl, beat the eggs and sugar until creamy. Add that to the bread mixture and stir until uniform. Pour the batter into a buttered pan and place that pan in a larger pan of hot water in the oven. Bake for 45 minutes, or until the center is set.