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A golden brown brioche french toast casserole with a cinnamon streusel topping in a white baking dish.
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Overnight Brioche French Toast Casserole

Prep Time20 minutes
Cook Time50 minutes
Total Time10 hours 10 minutes
Servings: 8 servings
Calories: 485kcal

Ingredients

  • 1 pound brioche bread, cut into 1-inch cubes
  • 8 large egg s
  • 2 cups whole milk
  • 1/2 cup heavy cream
  • 1/2 cup granulated sugar
  • 1 tablespoon vanilla extract
  • 1 teaspoon ground cinnamon
  • 1/4 teaspoon ground nutmeg
  • 1/2 teaspoon sal t
  • 1/2 cup unsalted butter, cold and cubed
  • 1/2 cup light brown sugar
  • 1/2 cup all -purpose flour
  • 1/2 teaspoon ground cinnamon

Instructions

  • Grease a 9x13 inch baking dish with butter or non-stick spray.
  • Place the brioche cubes into the prepared baking dish in an even layer.
  • In a large mixing bowl, whisk together the eggs, milk, heavy cream, granulated sugar, vanilla extract, cinnamon, nutmeg, and salt until well combined.
  • Pour the egg mixture evenly over the bread cubes, ensuring all pieces are moistened.
  • Cover the dish with plastic wrap and refrigerate for at least 8 hours or overnight.
  • When ready to bake, preheat the oven to 350°F (175°C).
  • In a small bowl, combine the cold butter cubes, brown sugar, flour, and cinnamon using a pastry cutter or fork until a crumbly texture forms.
  • Uncover the casserole and sprinkle the streusel topping evenly over the soaked bread.
  • Bake for 45 to 50 minutes, or until the top is golden brown and the custard is set.
  • Let rest for 5 minutes before serving.