Blueberry French toast bake layers cubes of buttery bread with juicy blueberries and a vanilla-cinnamon custard. A brown sugar streusel adds a lightly crisp topping that contrasts with the soft, custardy center.
The casserole is assembled several hours before baking, allowing the bread to absorb the egg mixture evenly. This makes it especially convenient for holidays, weekend brunches, and mornings when you want most of the preparation completed ahead of time.
Fresh or frozen blueberries both work well, and the finished casserole can be served with maple syrup, powdered sugar, or additional berries.
Why You’ll Love This Recipe
- The casserole can be assembled the night before.
- Brioche or challah creates a soft, rich center.
- Fresh or frozen blueberries can be used.
- Brown sugar streusel adds texture without requiring a separate sauce.
- One baking dish provides eight generous servings.
- Leftovers reheat well for another breakfast.
Ingredients
For the French Toast Bake
- 1 loaf (14 to 16 ounces) brioche or challah, cut into 1-inch cubes: Absorbs the custard while retaining enough structure.
- 2 cups fresh or frozen blueberries: Add juicy berry flavor throughout the casserole.
- 8 large eggs: Form the base of the custard.
- 2 cups whole milk: Provides moisture and helps soften the bread.
- 1/2 cup heavy cream: Adds richness to the custard.
- 1/2 cup granulated sugar: Sweetens the casserole.
- 2 teaspoons pure vanilla extract: Adds warm vanilla flavor.
- 1 teaspoon ground cinnamon: Complements the blueberries and bread.
- 1/4 teaspoon ground nutmeg: Adds subtle warm spice.
- 1/2 teaspoon kosher salt: Balances the sweetness.
- Nonstick cooking spray or butter: Prevents the casserole from sticking.
For the Streusel Topping
- 1/2 cup all-purpose flour: Provides structure for the topping.
- 1/3 cup packed light brown sugar: Adds sweetness and caramel flavor.
- 1/2 teaspoon ground cinnamon: Seasons the streusel.
- 1/8 teaspoon kosher salt: Balances the sugar.
- 4 tablespoons cold unsalted butter, cut into small pieces: Creates crisp, buttery crumbs.
Ingredient Substitutions
- Brioche or challah: Use French bread, croissants, or sturdy white bread. Avoid very soft sandwich bread.
- Fresh blueberries: Add frozen blueberries directly from the freezer without thawing.
- Whole milk: Two-percent milk or unsweetened plain dairy-free milk can be used.
- Heavy cream: Substitute half-and-half or additional whole milk.
- All-purpose flour: Use a 1-to-1 gluten-free baking flour in the streusel.
- Light brown sugar: Dark brown sugar can be used for a stronger molasses flavor.
- Unsalted butter: Use salted butter and omit the salt from the streusel.
- Brioche containing gluten: Use a sturdy gluten-free bread if needed.
How to Make Blueberry French Toast Bake
- Prepare the baking dish.
Lightly grease a 9-by-13-inch baking dish with butter or nonstick cooking spray. - Cut the bread.
Cut the brioche or challah into approximately 1-inch cubes. Slightly stale bread works especially well because it absorbs the custard without becoming overly soft. - Create the first layer.
Arrange half of the bread cubes evenly in the prepared baking dish. Sprinkle 1 cup of blueberries over the bread. - Complete the layers.
Add the remaining bread cubes and distribute the remaining blueberries across the top and between the pieces. - Prepare the custard.
Whisk the eggs in a large bowl until the yolks and whites are completely combined. Add the milk, heavy cream, granulated sugar, vanilla, cinnamon, nutmeg, and salt. - Pour the custard over the bread.
Slowly pour the egg mixture evenly across the casserole. Press the bread gently into the liquid with a spatula so the upper pieces begin absorbing the custard. - Chill the casserole.
Cover the baking dish and refrigerate for at least 4 hours or overnight. The bread should absorb most of the visible custard. - Prepare the streusel.
Combine the flour, brown sugar, cinnamon, and salt in a small bowl. Add the cold butter and work it into the mixture with a pastry cutter or fingertips until coarse crumbs form. Cover and refrigerate. - Prepare for baking.
Remove the casserole from the refrigerator while the oven preheats to 350°F. If using a glass baking dish, allowing it to warm slightly reduces the temperature difference between the refrigerator and oven. - Add the streusel.
Sprinkle the chilled streusel evenly over the soaked bread and blueberries. - Bake the casserole.
Bake uncovered for 45 to 55 minutes. The top should be golden, the edges should look slightly puffed, and the center should no longer contain liquid custard. - Protect the top if necessary.
If the streusel or bread begins browning too quickly, loosely cover the dish with aluminum foil during the final 10 to 15 minutes. - Check the center.
Insert a thin knife into the middle. It should come out moist but without uncooked egg mixture. Frozen blueberries may require several additional minutes. - Rest before serving.
Let the French toast bake rest for 10 minutes. Serve warm with maple syrup, powdered sugar, or additional blueberries if desired.
Tips for the Best Blueberry French Toast Bake
- Use slightly stale bread so it absorbs the custard while retaining structure.
- Cut the bread into evenly sized cubes.
- Distribute the blueberries between both bread layers.
- Whisk the eggs completely before adding the milk.
- Press the upper bread pieces gently into the custard before refrigerating.
- Chill the casserole for at least four hours for even absorption.
- Check the center rather than relying only on the color of the topping.
Common Mistakes to Avoid
Using Very Soft Sandwich Bread
Thin, soft bread can dissolve into the custard and create a mushy texture. Use sturdy brioche, challah, or French bread.
Skipping the Soaking Time
The center may bake unevenly if the bread has not absorbed the custard. Refrigerate for at least four hours.
Thawing Frozen Blueberries
Thawed berries release juice and can discolor the entire casserole. Add them directly from the freezer.
Underbaking the Center
The top may look finished while liquid custard remains beneath it. Check the middle with a thin knife before removing the casserole.
Cutting Immediately
Resting for 10 minutes allows the custard to settle and makes the casserole easier to portion.
Variations
Lemon Blueberry French Toast Bake
Add 1 tablespoon finely grated lemon zest to the custard. Serve with a small amount of lemon curd.
Blueberry Cream Cheese French Toast Bake
Scatter 8 ounces of cream cheese cut into small cubes between the bread layers.
Mixed Berry French Toast Bake
Replace 1 cup of blueberries with raspberries, blackberries, or chopped strawberries.
Pecan Streusel French Toast Bake
Add 1/2 cup chopped pecans to the streusel mixture.
Maple Blueberry French Toast Bake
Replace 1/4 cup granulated sugar with 1/4 cup pure maple syrup and reduce the milk by 2 tablespoons.
What to Serve With Blueberry French Toast Bake
- Bacon or breakfast sausage
- Scrambled eggs
- Plain or vanilla Greek yogurt
- Fresh fruit salad
- Maple syrup
- Hot coffee or tea
How to Store
Allow leftovers to cool before covering the baking dish or transferring portions to an airtight container. Refrigerate for 3 to 4 days.
Reheat individual servings in the microwave in short intervals. To restore some of the topping’s texture, reheat the casserole in a 325°F oven for 15 to 20 minutes.
Baked French toast casserole can be frozen for up to 2 months. Wrap individual portions tightly and place them in a freezer-safe container. Thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
Can I assemble the casserole the night before?
Yes. Assemble and refrigerate it overnight. Keep the streusel in a separate covered container and add it immediately before baking.
Can I use frozen blueberries?
Yes. Add them directly from the freezer. The casserole may need several additional minutes in the oven.
Why is my French toast casserole soggy?
The bread may have been too soft, the casserole may be underbaked, or too much liquid may have collected around thawed berries.
Can I bake it without refrigerating overnight?
Yes, but let it soak for at least 30 minutes before baking. A four-hour or overnight soak produces a more even texture.
What bread works best?
Brioche, challah, French bread, and croissants all work well. Slightly stale bread absorbs the custard especially effectively.
How do I know when it is fully baked?
The center should be set without visible liquid egg mixture. A knife inserted into the middle should come out moist but not coated in raw custard.
Can I prepare the streusel ahead?
Yes. Prepare it one or two days ahead and refrigerate it in an airtight container.
Final Thoughts
Blueberry French toast bake is a convenient make-ahead breakfast with soft custard-soaked bread, juicy berries, and crisp brown sugar streusel. A sturdy loaf and sufficient soaking time are the keys to an evenly baked casserole.