Overnight Blueberry Lemon French Toast Bake

Ouadie Rhabbouron

Overnight Blueberry Lemon French Toast Bake

This decadent breakfast casserole transforms simple ingredients into a show-stopping, custardy French toast studded with juicy blueberries and bright lemon zest. Assemble it the night before for an effortless, crowd-pleasing brunch.

Prep Time: 20 mins (plus overnight chill) | Cook Time: 45-50 mins | Total Time: 9+ hours | Servings: 8-10

Ingredients

For the Base:

  • 1 (14-16 oz / 400-450g) loaf French bread or brioche, cut into 1-inch thick slices or cubes

  • Butter, for greasing the dish

  • 2 cups fresh or frozen blueberries (do not thaw if frozen)

For the Custard:

  • 6 large eggs

  • 2 cups (480ml) whole milk

  • ½ cup (120ml) heavy cream (or additional milk)

  • ¾ cup (150g) granulated sugar

  • 1 tbsp pure vanilla extract

  • 1 tsp ground cinnamon

  • Zest of 1 lemon (key for brightness!)

For Serving (Optional):

  • Powdered sugar (icing sugar), for dusting

  • Maple syrup or blueberry syrup

  • Fresh blueberries and lemon wedges

  • Whipped cream

Instructions

1. Prepare the Dish:

  • Generously butter a 9x13-inch (23x33 cm) baking dish.

2. Assemble the Casserole:

  • Arrange the bread slices or cubes in the prepared dish in an even layer, overlapping slightly if using slices.

  • Scatter half of the blueberries (1 cup) evenly over and in between the bread pieces.

3. Make the Custard:

  • In a large bowl, vigorously whisk together the eggs, milk, heavy cream, sugar, vanilla, cinnamon, and lemon zest until the sugar is dissolved and the mixture is completely smooth.

4. Soak Overnight:

  • Pour the custard mixture evenly over the bread and blueberries. Press down lightly with a spatula to ensure all bread is submerged.

  • Scatter the remaining 1 cup of blueberries over the top.

  • Cover the dish tightly with plastic wrap and refrigerate for at least 8 hours, or overnight.

5. Bake:

  • The next morning, preheat your oven to 350°F (175°C). Remove the casserole from the fridge and let it sit at room temperature for 20-30 minutes while the oven heats.

  • Remove the plastic wrap. Bake for 45-55 minutes, or until the top is deeply golden brown, the center is set (no liquid jiggle), and a knife inserted in the center comes out clean.

6. Serve:

  • Let the French toast bake cool for 10-15 minutes before slicing. This allows the custard to set.

  • Dust with powdered sugar and serve warm with maple syrup, extra berries, and whipped cream.

Pro Tips for Success

  • Bread Choice: Stale, day-old bread is best! It soaks up the custard without disintegrating. Challah, brioche, or a crusty French loaf are perfect.

  • Don't Skip the Soak: The overnight rest is non-negotiable for the signature custardy texture.

  • Avoid Sogginess: Ensure your oven is fully preheated. If the top browns too quickly, tent loosely with aluminum foil.

  • Flavor Variations:

    • Mixed Berry: Use a mix of raspberries, blackberries, and blueberries.

    • Apple Cinnamon: Replace blueberries with 2 cups of thinly sliced apples tossed with cinnamon and brown sugar.

    • Cream Cheese: Dot 4 oz of cubed cream cheese over the bread before adding the custard.

  • Make-Ahead & Storage: This is designed to be made ahead! Leftovers keep covered in the fridge for up to 3 days. Reheat individual portions in the microwave or the whole dish, covered, in a 300°F (150°C) oven until warm.

Enjoy your spectacular, no-fuss brunch masterpiece

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