Overnight Blueberry French Toast Casserole

Why You’ll Love Overnight Blueberry French Toast Casserole Recipe

This make-ahead casserole makes mornings easier without sacrificing flavor or quality. Whether you’re feeding a crowd or looking for a hands-off weekend breakfast, it delivers comfort and sweetness in every bite. The custard-soaked bread becomes soft and fluffy, while the blueberries add a juicy, tangy contrast. The optional streusel topping takes it to the next level with a hint of crunch and warmth from cinnamon. Plus, it’s versatile and can easily be made gluten-free or dairy-free.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• 1 loaf (about 14 oz) day-old French bread, cut into 1-inch cubes

• 1 1/2 cups fresh or frozen blueberries

• 8 large eggs

• 2 1/2 cups milk (dairy or non-dairy)

• 1/2 cup maple syrup or honey

• 1 tsp vanilla extract

• 1/2 tsp ground cinnamon

• 1/4 tsp salt

Topping (optional):

• 1/2 cup all-purpose flour

• 1/2 cup brown sugar

• 1 tsp cinnamon

• 1/4 cup butter or coconut oil, chilled and cut into pieces

Directions

1. Lightly grease a 9×13-inch baking dish. Spread half of the cubed bread into the dish and sprinkle with half of the blueberries. Repeat the layers with remaining bread and blueberries.

2. In a large mixing bowl, whisk together the eggs, milk, maple syrup, vanilla, cinnamon, and salt. Pour the mixture evenly over the bread layers.

3. Cover with foil and refrigerate overnight or for at least 6 hours.

4. If using the topping, mix flour, brown sugar, and cinnamon in a bowl. Cut in the butter or coconut oil until the mixture resembles coarse crumbs. Store covered in the fridge overnight.

5. When ready to bake, preheat oven to 350°F (175°C). Sprinkle the topping over the casserole, if using.

6. Bake uncovered for 45–55 minutes until golden brown and cooked through.

7. Let rest for 5–10 minutes before serving.

Servings and timing

Servings: 8 servings
Prep Time: 15 minutes
Cooking Time: 50 minutes
Total Time: 1 hour 5 minutes
Calories per Serving: 310 kcal

Variations

• Berry Swap: Use raspberries, strawberries, or a mixed berry blend instead of blueberries.

• Bread Options: Try brioche, challah, or cinnamon swirl bread for extra richness.

• Add Nuts: Sprinkle chopped pecans or walnuts into the layers or the topping.

• Make it Dairy-Free: Use almond, oat, or soy milk, and swap butter for coconut oil.

• Make it Gluten-Free: Use your favorite gluten-free bread.

• Add Zest: Add a teaspoon of lemon zest for a bright flavor boost.

• Chocolate Twist: Sprinkle chocolate chips between layers for a dessert-like version.

• Savory-Sweet: Add a layer of cooked bacon for a salty contrast.

• No Topping Needed: It’s just as delicious without the optional crumb topping.

• Mini Casseroles: Bake in ramekins for individual portions.

Storage/Reheating

Storage: Store leftovers covered in the refrigerator for up to 3 days.
Reheating: Reheat individual portions in the microwave for 1–2 minutes, or warm the whole dish in a 300°F (150°C) oven for 15–20 minutes.
Freezing: You can freeze the unbaked casserole (without topping) for up to 2 months. Thaw in the fridge overnight before baking.

FAQs

How far in advance can I prepare this casserole?

You can prepare it up to 24 hours in advance before baking. Just keep it covered in the refrigerator.

Can I use frozen blueberries?

Yes, both fresh and frozen blueberries work well. No need to thaw frozen blueberries before using.

What kind of bread is best?

Day-old French bread is ideal, but any sturdy, crusty bread like brioche or sourdough works well.

Can I make this without eggs?

Egg substitutes like a flax egg or commercial egg replacers can work, but the texture will change.

Is this recipe sweet enough on its own?

It has a mild sweetness, but you can drizzle extra maple syrup over the top when serving.

Can I make this in a slow cooker?

This recipe is best baked in the oven for proper texture, but some slow cooker adaptations exist.

How do I know when it’s done baking?

The top should be golden brown and the center should be set. A knife inserted should come out clean.

Can I add cream cheese?

Yes, chunks of cream cheese can be layered with the bread and blueberries for a richer version.

Is this recipe kid-friendly?

Absolutely. The soft texture and sweet flavor make it a hit with kids.

Can I serve this cold?

It’s best served warm, but leftovers can be eaten cold or at room temperature if preferred.

Conclusion

This Overnight Blueberry French Toast Casserole is a breakfast dream come true—easy to prepare, crowd-pleasing, and endlessly customizable. Whether you’re hosting brunch, planning a holiday breakfast, or just want something special for the weekend, this cozy bake delivers delicious results every time.