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["Butter a 13x9"" baking dish. Arrange bread slices in overlapping rows in dish.", "Cook cream, milk chocolate, semisweet chocolate, and vanilla in a medium saucepan over medium heat, whisking constantly, until chocolate is melted, about 5 minutes; remove from heat. Transfer 1 cup chocolate mixture to an airtight container; let cool to room temperature, then cover and chill until ready to serve. Reserve remaining chocolate mixture.", "Whisk eggs, milk, sugar, and salt in a large bowl. Whisking constantly, pour in hot chocolate mixture in a slow, steady stream. Pour evenly over and between each layer of bread. Push down with your hands to soak top of bread. Cover dish tightly with foil and chill at least 2 hours.", "Preheat oven to 350u00b0F. Bake foil-covered bread until warmed through and a knife inserted into the center feels warm to the touch, about 35 minutes. Remove foil and continue baking until bread is browned, 35-40 minutes longer. Let cool 10 minutes.", "Meanwhile, toast hazelnuts in a small skillet over medium heat, tossing occasionally, until golden-brown and fragrant, 3-5 minutes. Microwave 1 cup reserved chocolate mixture in a microwave-safe bowl in 10-second intervals (or heat in a heatproof bowl set over a saucepan of simmering water), stirring occasionally, until warmed through.", "Serve French toast with hot chocolate sauce and toasted hazelnuts.", "French toast can be assembled 1 day ahead before baking; cover tightly with foil and chill."]
