Unbelievable Blueberry French Toast Casserole.

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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 sallysbakingaddiction.com

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 sallysbakingaddiction.com

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 sallysbakingaddiction.com

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 sallysbakingaddiction.com

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 sallysbakingaddiction.com

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

Ingredients:

  • 1 (12-14 ounce) loaf french bread, sourdough bread, or challah1
  • 1 cup (180g) fresh or frozen blueberries2
  • 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) 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

Directions:

  1. Grease a 9x13 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.

Make ahead tip: 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.

Recipe Notes:

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.

  1. 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.
  2. Instead of blueberries, try strawberries, raspberries, or blackberries. In the fall, try cranberries or thinly sliced apples or pears. So many options!

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

 

223 Comments

All Comments

  1. Amazing! This casserole was the hightlight of my buffet! Everybody loved it and I will be making it again! Great (small) leftovers this morning and good cold. Thank you!

  2. Made this for our Christmas Eve brunch – everyone loved it! Said it was so good. Such a time saver too to make it the day before!

  3. Took one bite and said, “Oh my Word!” This dish is fantastic. Not something you’d have every day, but for a special breakfast treat, it’s awesome! Followed the recipe to a “T” using the French bread as mentioned. Thank you!

  4. Could this be done with out the streusel?? I’m looking for an easy make ahead french toast casserole that’s essentially just french toast..

  5. Hello! This looks wonderful. The Elliott Homestead blog makes one like this, but she uses banana and blueberry in hers. However, this looks just as delicious! One question I have is do you recommend freezing before baking or freezing after baking? I just want to know your opinion on which option maintained the flavor and texture better. I am hoping also to split this mixture-one part that we eat right away and the other part we freeze. Thanks so much!

    1. Either way works, Amy! See the make ahead tip at the end of the recipe for directions on both freezing methods 🙂

  6. This is so amazing. Every time I make it someone asks for the recipe. It’s good with a scoop of vanilla ice cream, too. 😉

  7. This recipe is our new family favourite! I made it when we went camping in our trailer and it was so easy to bake in the morning! Best breakfast ever! Thank you! I just put my 9×9 pan in the fridge for overnight as there’s just 3 of us! Have a wonderful weekend! ♥️

  8. Hi,
    Do I have to let the bread soak for 3 hrs to overnight if I plan to freeze? Also, should I add the streusel topping before I freeze? Thanks!

    1. Hi Katleen, Yes, you want to prepare the recipe all the way through step 4 before freezing so that the bread has a chance to soak up the liquid before freezing!

  9. I find I need more egg/custard mixture in order to cover the bread… I’ve done it with less, but it seems pretty crusty on top for those bread pieces that didn’t really get soaked. Thoughts?

  10. Just wanna say I’ve made this before, several times now. It is just sooooo good, that streusel topping takes it to a whole other level (though it is good without too, which I’ve done!). I love that you can make it ahead, and it’s very easy to make too. Thanks for giving me a recipe for my collection!

  11. Try topping this with a whiskey banana sauce. Just use jelo cook n serve pudding cooked with your favorite whiskey or rum and pour over top… Oh man!

  12. How does this reheat? My son wants to take this on a camping trip. There is no way to bake at the camp out so he needs to bake it the day before, transport in a cooler overnight, and reheat on a grill the first morning. Do you think this re-heat well this way?

  13. I was in a hurry and just bought the bread that is dried out that you use for stuffing. Super dry! BUT…..I just added 2 more eggs and 1 cup more of milk, soaked overnight and it turned out perfect. OH I LOVE THIS STUFF! What an easy breakfast. I served it with another overnight sausage, egg and hash brown bake and some fresh fruit. Great brunch! Best ever French Toast Casserole! Quick and easy! Definitely making for Thanksgiving and Christmas breakfasts too! Thank you so much for sharing this recipe with all of us. This may be strange but I love eating it cold too!

  14. Sounds like the perfect comfort food! I am thinking of making this for Passover, using stale sponge cake (as we don’t use bread during the holiday). That looks like the only conversation necessary…I’ll let you know how it works out! But will also try it the conventional way too!

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Reviews

  1. Took one bite and said, “Oh my Word!” This dish is fantastic. Not something you’d have every day, but for a special breakfast treat, it’s awesome! Followed the recipe to a “T” using the French bread as mentioned. Thank you!

  2. This is so amazing. Every time I make it someone asks for the recipe. It’s good with a scoop of vanilla ice cream, too. 😉

  3. This recipe is our new family favourite! I made it when we went camping in our trailer and it was so easy to bake in the morning! Best breakfast ever! Thank you! I just put my 9×9 pan in the fridge for overnight as there’s just 3 of us! Have a wonderful weekend! ♥️

  4. Try topping this with a whiskey banana sauce. Just use jelo cook n serve pudding cooked with your favorite whiskey or rum and pour over top… Oh man!

Questions

  1. Could this be done with out the streusel?? I’m looking for an easy make ahead french toast casserole that’s essentially just french toast..

  2. Hello! This looks wonderful. The Elliott Homestead blog makes one like this, but she uses banana and blueberry in hers. However, this looks just as delicious! One question I have is do you recommend freezing before baking or freezing after baking? I just want to know your opinion on which option maintained the flavor and texture better. I am hoping also to split this mixture-one part that we eat right away and the other part we freeze. Thanks so much!

    1. Either way works, Amy! See the make ahead tip at the end of the recipe for directions on both freezing methods 🙂

  3. Hi,
    Do I have to let the bread soak for 3 hrs to overnight if I plan to freeze? Also, should I add the streusel topping before I freeze? Thanks!

    1. Hi Katleen, Yes, you want to prepare the recipe all the way through step 4 before freezing so that the bread has a chance to soak up the liquid before freezing!

  4. How does this reheat? My son wants to take this on a camping trip. There is no way to bake at the camp out so he needs to bake it the day before, transport in a cooler overnight, and reheat on a grill the first morning. Do you think this re-heat well this way?

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