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Blueberry French Toast Casserole Recipe

Blueberry French Toast Casserole Recipe

Soft brioche soaks in a vanilla-cinnamon custard, bakes up with juicy blueberries, and finishes with a buttery streusel. Perfect for make-ahead brunch.
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Prep Time: 20 minutes
Cook Time: 45 minutes
Total Time: 1 hour 5 minutes
Servings: 8

Ingredients
 

Main Ingredients

  • 10 cup brioche bread, cut into 1-inch cubes day-old works best
  • 2.25 cup blueberries fresh or frozen; if frozen, do not thaw
  • 7 large eggs room temperature if possible
  • 1.5 cup whole milk
  • 0.5 cup heavy cream
  • 0.33 cup granulated sugar
  • 0.25 cup light brown sugar for custard
  • 2 tsp vanilla extract
  • 0.75 tsp ground cinnamon for custard
  • 0.25 tsp fine sea salt for custard
  • 1 tsp lemon zest optional but brightens flavor
  • 1 tbsp unsalted butter, melted for greasing the dish
  • 0.5 cup all-purpose flour for streusel
  • 0.33 cup packed brown sugar for streusel
  • 4 tbsp unsalted butter, cold and cubed for streusel
  • 0.5 tsp ground cinnamon for streusel
  • 0.13 tsp fine sea salt for streusel

Instructions

Preparation Steps

  • Grease a 9x13-inch baking dish with the melted butter.
  • Spread bread cubes in the dish and scatter half the blueberries over the top.
  • Whisk eggs, milk, cream, granulated sugar, 1/4 cup brown sugar, vanilla, 3/4 tsp cinnamon, 1/4 tsp salt, and lemon zest.
  • Pour the custard evenly over the bread and gently press to help it soak in.
  • Sprinkle on the remaining blueberries. Let stand 20–30 minutes or cover and chill up to overnight.
  • Heat the oven to 350°F while the casserole rests.
  • Make streusel: Combine flour, 1/3 cup brown sugar, 1/2 tsp cinnamon, and a pinch of salt in a bowl.
  • Cut in the cold butter until crumbles form and hold together when squeezed.
  • Scatter the streusel evenly over the casserole.
  • Bake 40–45 minutes, until puffed, golden, and the center is set.
  • Rest 10 minutes before serving. Add maple syrup or extra berries if you like.

Notes

Try swapping half the blueberries with raspberries, or stir a spoonful of lemon curd into the custard for extra zing. If using frozen berries, add them straight from the freezer to prevent purple streaking.
To make ahead, assemble the casserole, cover, and refrigerate overnight; add the streusel just before baking. Store leftovers in the fridge up to 3 days and reheat, covered, at 325°F until warm.
This recipe is an original creation inspired by classic Blueberry French Toast Casserole Recipe flavors. All ingredient ratios and instructions are independently developed.