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Overnight Buttermilk French Toast Casserole Recipe

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  • Total Time: 55 minutes
  • Yield: 11 1x


The baguette bread in this overnight breakfast recipe is the key to a yummier, firmer, french toast casserole in the morning.



Batter Ingredients

  • 1 1/2 loaves baguette bread
  • 15 large eggs
  • 2 3/4 cups milk
  • 1/2 cups buttermilk
  • 3/4 cups heavy cream
  • 1 tbsp espresso powder (optional – but it’s a nice kick!)
  • 2 tbsp pure vanilla
  • 3/4 cup turbinado sugar
  • 1 tbsp cinnamon


  • 8 tbsp cold unsalted butter (blender optional – we cube the cold butter and mix with our hands)
  • 2 1/4 cups turbinado sugar
  • 1 cup flour
  • 1/4 tsp sea salt


  1. Cut bread into cubes and spread evenly into a greased 9 x 13″ pan and 8 x 8″ pan. It’s important not to overload the bread in layers or the egg mixture will not be enough. 
    Cubed Baguette Bread French Toast Casserole
  2. In a bowl, whisk together eggs, buttermilk, milk, cream, espresso powder, turbinado sugar, and cinnamon.
    Add Egg Cream Buttermilk French Toast Casserole
  3. Pour the egg mixture over the baguette bread, covering the top slightly. Cover and refrigerate overnight, at least 7 hours.
    Egg Mixture Covering Baguette Bread French Toast Casserole
  4. Combine the butter, sugar, flour and sea salt. Mix with your hands until crumbly. Put in a ziplock bag and store in the refrigerator until the morning. 
    Mix Crunchy Topping for French Toast Casserole
  5. In the morning, set the oven to 350 degrees. Take out the casserole and top evenly with the crumb topping.
    Crunchy Topping Sprinkled on French Toast Casserole
  6. Bake for 40-50 minutes until all egg is cooked and it’s as crunchy as you like it. 
  • Prep Time: 15 minutes
  • Cook Time: 40 minutes
  • Category: Breakfast
  • Cuisine: American
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