Blueberry French Toast Casserole

There’s not one word more perfect than “unbelievable” to describe this overnight blueberry french toast casserole. Perfect make-ahead recipe for busy mornings!

Unbelievable Blueberry French Toast Casserole! This is the perfect crowd-pleasing make ahead recipe for busy mornings. Recipe on

Now THIS is french toast! Made with chunks of crusty bread, sweet blueberries, lots of brown sugar, a sweet egg-y custard, assembled in a baking pan, and topped with brown sugar cinnamon streusel.

There’s enough goodness to make your entire family happy. And then some.

Unbelievable Blueberry French Toast Casserole! This is the perfect crowd-pleasing make ahead recipe for busy mornings. Recipe on

This casserole is the definition of comfort food. I made it for my friends Kristin and Chris who just welcomed baby girl Keira Elizabeth to the world. Guess I should’ve used strawberries, huh? Oh well. I prepped the french toast the night before and brought the dish to them the next morning after baking it for about 45 minutes. That’s the beauty of this breakfast… it’s designed to be made ahead of time.

It’s designed to MAKE LIFE EASIER!

I typically use challah bread when I make french toast– either in traditional form or as a casserole. You can use sourdough bread or french bread too. Homemade or store-bought, whichever is easiest. Even homemade honey-oat bread would be fantastic. No matter what type of bread you use– make sure it’s crusty. Day-old and a little stale. Bread that’s been sitting out a day or two (and therefore has lost some moisture) will absorb much more of the egg custard.

Speaking of the egg custard. What you’ll make is a thick mixture of eggs, milk, brown sugar, vanilla, and cinnamon. 1/2 teaspoon of cinnamon will go into the custard AND in the streusel on top. The cinnamon soaking into the bread is phenomenal!

For that creamy custard taste, I use 8 eggs total and a little over 2 cups of whole milk. Whole milk is key; I don’t suggest a lower fat milk. Even half-and-half would do. You want a luxurious, thick custard. As always, I use Eggland’s Best eggs here. Not only am I an official brand ambassador of this well respected company, I’m also a huge fan of the quality and taste of their eggs. Always have been!

Sally's Baking Addiction | Overnight Blueberry French Toast Casserole

You’ll cut the bread up into cubes, pour the custard overtop, and stick the whole pan in the refrigerator. During this time, the crusty bread soaks up the cinnamon spiced egg custard, imparting flavor and moisture into the dish as a whole. You can leave it in the refrigerator anywhere from overnight down to 3-4 hours. I find the longer the bread soaks, the tastier the casserole. So, put the refrigerator to work!

Unbelievable Blueberry French Toast Casserole! This is the perfect crowd-pleasing make ahead recipe for busy mornings. Recipe on

During the last few minutes of fridge-time, prepare a brown sugar streusel topping. This is like icing on the cake. The streusel topping is made from equal parts brown sugar and flour, a dose of cinnamon, and cold butter. Emphasis on the cold! The butter is cut into the other 3 ingredients using a pastry blender. Alternatively, you can use two forks or even your fingers.

Sprinkle it over the soaked bread and bake until golden brown. This is the kind of breakfast you make on the weekend not only to gobble up with friends and family, but to smell it as it bakes. I always thought baking banana bread was the best aroma from the oven but this… oh man. It’s even better.

Overnight Blueberry French Toast Casserole-- make ahead breakfast brunch recipe found on

There’s so much texture and flavor, but I think the best part of this overnight french toast is the juicy blueberries. They pop and burst, leaving sweet blueberry juice in between all the cracks and crevices of the casserole.

Unbelievable Blueberry French Toast Casserole! This is the perfect crowd-pleasing make ahead recipe for busy mornings. Recipe on

Fill your plate and top it all with maple syrup, butter, fresh fruit, or a shower of confectioners’ sugar. There’s no wrong way to eat this unbelievable goodness! Just as long as you go back for seconds.


Unbelievable Blueberry French Toast Casserole

  • Author: Sally
  • Prep Time: 25 minutes
  • Cook Time: 50 minutes
  • Total Time: 9 hours, 30 minutes
  • Yield: serves 12
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American


There’s not one word more perfect than “unbelievable” to describe this overnight blueberry french toast casserole. Perfect make-ahead recipe for busy mornings!


  • 1 (12-14 ounce) loaf french bread, sourdough bread, or challah*
  • 1 cup (180g) fresh or frozen blueberries*
  • 8 large eggs
  • 2 and 1/4 cups (540ml) whole milk
  • 1/2 teaspoon ground cinnamon
  • 3/4 cup (150g) packed light brown sugar
  • 1 Tablespoon (15ml) pure vanilla extract

Streusel Topping

  • 1/3 cup (69g) packed light brown sugar
  • 1/3 cup (42g) all-purpose flour (spoon & leveled)
  • 1/2 teaspoon ground cinnamon
  • 6 Tablespoons (86g) unsalted butter, cold and cubed
  • optional: extra blueberries, fresh fruit, maple syrup, and/or confectioners’ sugar for topping


  1. Grease a 9×13 inch pan with butter or spray with nonstick spray. Slice then cut the bread into cubes, about 1 inch in size. Spread cubes into the prepared baking pan and top evenly with blueberries. Set aside.
  2. Whisk the eggs, milk, cinnamon, brown sugar, and vanilla together until no brown sugar lumps remain. Pour over the bread. Cover the pan tightly with plastic wrap and stick in the refrigerator for 3 hours – overnight. Overnight is best.
  3. Preheat oven to 350°F (177°C). Remove pan from the refrigerator.
  4. Prepare the topping: Whisk the brown sugar, flour, and cinnamon together in a medium bowl. Cut in the cubed butter with a pastry blender or two forks. Sprinkle the topping over the soaked bread.
  5. Bake for 45-55 minutes or until golden brown on top. I usually bake it for 45 minutes because I like it softer. Serve immediately. Cover leftovers tightly and store in the refrigerator for 2-3 days.


  1. Make Ahead & Freezing Instructions: Prepare the topping in advance, cover tightly, and store in the refrigerator. Sprinkle over the soaked bread before baking. For freezing, prepare the recipe through step 4 (without preheating the oven) and freeze for up to 2 months. Thaw overnight in the refrigerator then bake as directed. Baked casserole can be frozen up to 3 months. Thaw overnight in the refrigerator and warm up in a 350°F (177°C) for 35 minutes or until warm in the center.
  2. Half Batch: This recipe can easily be halved in an 8 or 9-inch baking pan. The bake time will be slightly less, around 30-35 minutes.
  3. Bread: Day-old, crusty bread is perfect for french toast casseroles. I typically use a loaf of challah bread that I slice and let sit out overnight. You’ll wind up with about 12 cups of cubed bread. A little more or less is OK.
  4. Fruit: Instead of blueberries, try strawberries, raspberries, or blackberries. In the fall, try cranberries or thinly sliced apples or pears. So many options!

Keywords: overnight french toast casserole, blueberry french toast casserole

Unbelievable Blueberry French Toast Casserole! This is the perfect crowd-pleasing make ahead recipe for busy mornings. Recipe on


  1. Using challah for French toast is a must. If there are any kosher grocery stores in your area, they’ll have the best, eggiest challahs. Trust me, it’s worth the trip!
    New mommies need casseroles. I was so grateful for them with each kid. You’re awesome to make this for her!

    1. It was either this or a savory casserole. I figured their fridge or freezer was probably full of the savory stuff. (and yep, I was right!)

  2. Bread doesn’t last long in my home, so I usually have to dry the bread in the oven when making french toast. But that’s totally ok, because this looks unbelievably delicious! 😉

  3. Did you REALLY just make French Toast Casserole WITH A STREUSEL TOPPING?
    I love you for it. And I love this casserole! However, I have never even tried Challah Bread (I KNOW.) so clearly I need to get my taste buds in action – pinned!

    1. Taylor! Challah is, hands down, the best bread on the planet. Get it fresh from the bakery or make your own. And it makes amazing french toast!

  4. I adore french casserole and adding berries always makes it better. Perfect for Sunday mornings.
    Have a beautiful Wednesday Sally!

  5. This sounds absolutely incredible! And it’ll be the perfect birthday breakfast for my blueberry loving fiancé for his birthday next weekend – pinned to my Pinterest ready to go!

    Thanks for sharing 🙂

  6. I feel like you’re inside my head this week, Sally, and it’s creeping me out but in the best possible way! First carrot cake and now a French toast casserole?! French toast is my absolute favourite brunch! This looks totally delish and I’m digging the streusel. Will be making very soon! Thanks!

  7. I’m rolling up my sleeves to make this amazing breakfast casserole this weekend. Is it Friday yet? This would be perfect for brunch especially with mimosas involved in the mix. My mom makes an apple french toast bake that’s to die for, but this sounds like the perfect spring breakfast.

  8. So glad you posted more blueberry stuff! I’ll definitely be trying this out this weekend for a Sunday morning brunch with friends.

  9. Do you let the dish come to room temperature before baking or go straight from the fridge to the preheated oven? I am fairly new to baking and wasn’t sure if this would warp my metal pan or break a glass dish going from cold to hot. Thanks for any tips!

    1. Hey Melissa! By the time the streusel is made and the oven has pre-heated, the pan is less cold. I never let it fully come to room temperature (I always use glass) but you can if you’d like.

      1. You are a baking wizard and I love your site! I’ve made this before with blueberries, strawberries, and I think apples…always to high praise. Anyway, this time I tried leaving out berries and adding in raisins and a splash of spiced rum. It’s soaking now…hope it works!

  10. I think I know what my family will be having Easter morning! I think we’ll try strawberries or raspberries. Thanks for the inspiration!

  11. I love overnight breakfast dishes! This looks awesome. I try to cube the bread a day ahead to make sure it’s not too soft. With French toast bakes I usually let them sit 20-25 minutes after they come out of the oven before serving to set. My people prefer it more set then soft, just preference I guess. These blueberries would pair good with a touch of lemon zest. Thanks for another awesome recipe Sally!! My kids have already put in their orders for Sally’s cookies and muffins during Easter. 🙂

  12. I can totally believe that this is unbelievable!!! I’ve never seen a streusel topping on a french toast casserole. Game changer! Can’t wait to try it!

  13. Oh. My. Gosh. I. Love. This. Recipe! Actually, I know someone who would love this recipe even more than me… my mom! She loves anything “blueberry”. Blueberry muffins, blueberry donuts, blueberry butter – she’s blueberry crazy! But since you posted this amazing recipe, I know EXACTLY what I will be making her for mothers day! She’ll love it! And the best part has to be that streusel topping. My, oh my! Is the bread that you used and that’s pictured challah? I feel like I’ve used sourdough in some of my breakfast casseroles and it always ends up soggy? Great recipe! You are amazing, I love following your blog!

    1. Yep, that’s challah bread. It’s my favorite for french toast. Whatever type of bread you use, make sure it’s crusty. Slice/cut it and leave it out overnight. The more crusty, the less soggy after baking.

  14. This looks so good I think it would even taste good as a dessert! With all that streusel topping, who would even know?! I need to try the challah bread too… I’m reading all these comments on how amazing it is and I feel like I’m missing out!

  15. I’ve been following your website for a few months. I really love how geeky you get about the science of cooking. It really makes you think about what ingredient does what to the overall result. 🙂

    My husband loves french toast so I will be making this soon for him. I like adding chocolate to everything. What do you think about substituting blueberries with chocolate chips in this recipe?

  16. Hey Sally! This looks absolutely amazing!!! Hope you’re doing well and I can’t wait to buy Sally’s Candy Addiction! 🙂

  17. Love making baked French toast! I think I have made more of it than any other breakfast food combined because it’s so easy! I love the blueberries and the streusel topping and how pretty it looks! And that napkin you used captures all the colors of the recipe on it…nice touch 🙂

  18. Guess what I will be making this weekend? Cake AND French toast! Ha! I might make this and have it for breakfast Friday morning. Get a jump start on the weekend goodies! My NatureBox came in today and we love ALL of what we got. Can’t wait to get our next shipment in 😉

      1. Yes, we have the strawberry Greek yogurt pretzels and I can’t stay out of them! They aren’t going to last very long, ha!!

  19. That looks delicious! I’ve made casseroles like that before and the streusel just takes it over the top! I’ve used french bread, italian bread and even bagels, but never challah. I’m not even sure I can get challah bread at stores here…maybe you should post a recipe so I can try making it at home!

  20. Oh I just love French toast casserole! I had some at a part recently and it was amazing. However, it didn’t have blueberries or a streusel topping! This one looks even more amazing!

  21. This looks heavenly yummy….Challah definitely is the best bread for French toast…I now know what I will be making this Sunday.

    By the way, I normally add maple syrup into the egg mixture for my french toast souffle….do you think this will taste as good if I substitute the syrup for the 3/4 cup brown sugar?

  22. Hi Sally!
    Would this work without the blueberries? Or do you have another French toast casserole type thing? Thanks!

  23. Hi Sally! This looks incredible and I cannot wait to make it for my coworkers! Do you think I could bake it in a muffin tin? Can you imagine the cuteness? 🙂
    Love your blog!

  24. Oh my, this sounds like an absolute dream! ♥
    I generally love pairing blueberries with cinnamon – it’s such a tasty combination of flavours 🙂
    I’m thinking about making this for my family on Easter morning ^_^

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I’m Sally, a cookbook author, photographer, and blogger. My goal is to give you the confidence and knowledge to cook and bake from scratch while providing quality recipes and plenty of pictures. Grab a cookie, take a seat, and have fun exploring! more about Sally