Soft, custardy, and bursting with fresh lemon and juicy blueberries, this lemon blueberry buttermilk French toast casserole is the kind of make-ahead breakfast that feels effortlessly special. Baked until lightly golden with crisp edges and a tender center, it’s perfect for spring brunch, holidays, or any morning that calls for something warm and inviting.
There’s something about a baked French toast casserole that just makes mornings feel a little more special, especially when it’s bursting with fresh spring flavors like lemon and blueberry.
This lemon blueberry French toast casserole is one of those recipes I come back to when I want something easy, make-ahead, and guaranteed to impress. It’s soft and custardy in the center, lightly golden on top, and layered with bright lemon flavor and juicy blueberries in every bite.
I love making this for holidays like Easter or Mother’s Day, but honestly, it’s just as perfect for a slow weekend at home or even a busy week when you want breakfast ready to go. You can prep it the night before and bake it in the morning, no stress, no fuss.
If you’re looking for a French toast casserole that feels fresh, light, and just a little bit special, this is the one to save.
Author’s Note
This is one of those recipes I come back to every spring. There’s something about the combination of lemon and blueberries that instantly makes everything feel lighter after a long winter.
I’ve made versions of this for holidays, family brunches, and even just because we had extra bread to use up and every time, it disappears faster than I expect. It’s simple, reliable, and exactly the kind of recipe I love sharing here.
For other times I am craving a comforting breakfast casserole I made Churros French Toast and Tres Leches French Toast just in case lemon blueberry wasn’t the right call (it rarely isn’t!).
Enjoy!
French Toast Ideas For Your Next Brunch
Why This Recipe Works
- Buttermilk creates a rich, tender custard with just the right amount of tang
- The balance of bright lemon + sweet blueberries keeps it fresh, not heavy
- Make-ahead friendly that’s perfect for overnight prep
- Soft, custardy center with lightly crisp, golden edges
- Feeds a crowd, making it ideal for brunch and gatherings
Make it overnight
This is where this recipe really shines. To make this French toast casserole the night before you need to:
- Assemble everything the night before
- Cover and refrigerate overnight
- Bake fresh in the morning
Not only does this save time, but it also allows the bread to fully absorb the custard giving you that soft, bakery-style texture throughout.
What to serve with?
This casserole pairs beautifully with simple sides to round out the meal:
- Fresh fruit platter
- Crispy bacon or breakfast sausage
- Yogurt with honey or granola
- Chia pudding with berries
- Sweet fried plantains
- Fresh juice, coffee, or tea
If you’re hosting, I like to keep everything else simple and let this be the centerpiece.
Silvia’s TIPS
➜ For a crispier top, bake uncovered for the final minutes
➜ Use slightly stale bread for the best texture
➜ Don’t skip the buttermilk, it adds depth and tenderness and flavor
➜ Add extra lemon zest for a brighter flavor
➜ Let it rest a few minutes after baking before serving
This is one of those recipes that checks all the boxes for me: simple, make-ahead, seasonal, and something my family genuinely gets excited about.
And after years of cooking and sharing recipes, those are always the ones worth keeping.
Save this one, you’ll come back to it more than you think!
Lemon Blueberry French Toast Casserole
Ingredients
- 1 loaf sourdough sliced bread cubed
- 16 oz buttermilk
- 1/2 cup honey
- 2 tsp vanilla extract
- 8 eggs
- 2 tsp lemon zest
- 2 cups blueberries
Instructions
- Preheat the oven to 350°F and lightly grease a baking dish.
- Prepare the bread by slicing or tearing the soft sourdough into thick pieces, then arrange them evenly in the baking dish.
- Make the custard in a large mixing bowl by whisking together the buttermilk, honey, vanilla extract, eggs, and lemon zest until smooth and well combined.
- Add the blueberries by scattering them evenly over and in between the bread pieces.
- Pour the custard mixture evenly over the bread, making sure all the pieces get coated. Gently press the bread down with the back of a spoon or spatula so it can soak up the liquid.
- Let it rest for about 15 to 20 minutes so the bread has time to absorb the custard. For an overnight version, cover and refrigerate, then bake the next morning.
- Bake uncovered for 45 minutes, or until the top is lightly golden and the center looks set.
- Let it cool slightly for about 5 to 10 minutes before serving. This helps the casserole set and makes it easier to slice.
- Serve warm as is, or top with extra blueberries, a drizzle of honey, lemon zest, mint leaves or a dusting of powdered sugar if desired.
Notes
- Use soft sourdough, not a crusty artisan loaf, so it absorbs the custard well.
- The casserole should look set in the center and lightly golden on top when done.
- Resting before serving gives you the best texture.
💛 Silvia’s Tip
This casserole reheats beautifully, especially in the oven. the edges crisp up again while the center stays soft and custardy.Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
I’d like to double this recipe and bake it all in one large baking dish. Do I need to adjust the baking time? thanks
Great question! Yes, if you’re doubling the recipe and baking it in one larger dish, you’ll likely need to increase the baking time “slightly”.
Because the mixture will be thicker, it takes a bit longer for the center to cook through. I recommend starting with the original baking time, then adding an extra 10–15 minutes, checking until the center is set. But remember the center should be custard-like but now raw 🙂
If you notice the top browning too quickly, you can loosely cover it with foil toward the end.
Hope that helps—let me know how it turns out! 💛