I first made this blueberry French toast casserole on a rainy Saturday morning when I wanted something hands off that still tasted like a bakery treat. It uses day old challah or brioche, fresh or frozen blueberries, and a simple custard so you can prep the night before and bake in the morning. If you like make ahead brunches, or you want a crowd pleasing breakfast that frees up oven space for other dishes, this is the kind of recipe you’ll return to again and again. For a similar sweet breakfast idea with a fun bite sized twist, try these cinnamon roll French toast bites.
Why you’ll love this dish
This casserole is fast to assemble, budget friendly, and forgiving. It stretches to feed a family but also scales down to a smaller dish. Using slightly stale bread means it soaks up the custard without going mushy, and the blueberries burst in the oven for bright pops of flavor. Make it for weekend brunch, a simple holiday morning, or an easy overnight breakfast when you don’t want to scramble at the last minute.
Preparing Quick Blueberry French Toast Casserole
Quick overview before you start: cube the bread, layer with berries, whisk a simple egg and milk custard, pour it over, then chill to let the bread absorb the mixture. Bake uncovered until golden and set. Plan for 10 minutes active prep, at least 2 hours chilling or overnight, and 30 to 35 minutes baking.
What you’ll need
- 10 slices day old or slightly stale bread, such as challah or brioche (sturdier sandwich bread works too)
- 2 cups fresh blueberries, or thawed frozen blueberries
- 6 large eggs
- 2 cups milk, whole or 2 percent
- 1/2 cup granulated sugar (start here and adjust to taste)
- 1 teaspoon vanilla extract
- 1 teaspoon ground cinnamon
- Butter for greasing the baking dish
- Powdered sugar for serving, optional
Notes on swaps: use half and half for a richer custard, or a non dairy milk like oat milk if you need dairy free. For lower sugar, reduce to 1/3 cup or swap part of the sugar for a tablespoon of maple syrup. If your bread is very fresh, toast the cubes for 5 to 8 minutes to dry them slightly so they hold the custard better.
Directions to follow
- Preheat the oven to 350°F 175°C and butter a 9 by 13 inch baking dish.
- Cut the bread into 1 to 1.5 inch cubes. Keep the crusts on for texture.
- Spread half the bread cubes in the bottom of the prepared dish. Scatter half the blueberries over the bread.
- Add the remaining bread cubes on top and sprinkle the rest of the blueberries evenly.
- In a medium bowl, whisk the eggs, milk, sugar, vanilla, and cinnamon until smooth and blended.
- Pour the egg mixture evenly over the bread and blueberries. Press gently with a spatula so the bread soaks up the custard.
- Cover the dish and refrigerate for at least 2 hours or overnight for best texture.
- When ready to bake, remove the cover. Bake for 30 to 35 minutes until the top is golden and the center is set. A knife inserted in the middle should come out mostly clean.
- Let the casserole cool for 5 to 10 minutes before serving. Dust with powdered sugar if you like.
Best ways to enjoy it
Serve slices warm straight from the oven with a few extra fresh blueberries on top and a dusting of powdered sugar. Add a dollop of Greek yogurt or whipped cream for richness. For a heartier brunch plate, serve with a simple green salad or fruit salad. If you want a hot sauce pairing, drizzle warm maple syrup or a lemon glaze to brighten the berries. For inspiration on other make ahead breakfast ideas, see this sweet bite sized option for gatherings cinnamon roll French toast bites.
Storage and reheating tips
Refrigerate leftovers in an airtight container for up to 4 days. Reheat individual portions in the microwave for 30 to 60 seconds, or rewarm slices in a 350°F 175°C oven for 8 to 12 minutes until heated through and the top is crisp. To freeze, wrap cooled portions tightly in plastic wrap and place in a freezer bag for up to 2 months. Thaw overnight in the fridge before reheating. Always discard any dairy based custard that has been left at room temperature for more than two hours.
Pro chef tips
- Use day old or slightly dried bread so the custard soaks evenly and you avoid a soggy bottom.
- Cut the bread into uniform cubes so everything cooks at the same rate.
- If using frozen blueberries, do not thaw completely and drain; gently toss them in a tablespoon of flour so they do not sink to the bottom.
- Press the bread firmly into the custard to remove air pockets and ensure even soaking.
- Let it rest overnight for the best texture but two hours will do in a pinch.
Flavor swaps
Try different berries like raspberries or sliced strawberries, or stir in a half cup of chocolate chips for a dessert style casserole. For a nutty crunch, sprinkle chopped pecans or sliced almonds on top before baking. To make it citrus bright, add a teaspoon of lemon zest to the custard. For a dairy free version, swap milk for an unsweetened plant milk and use a vegan butter to grease the dish.
FAQ
How long does prep and total time take?
Active prep is about 10 minutes. Chill for at least 2 hours or overnight. Bake for 30 to 35 minutes. Total time depends on chilling; plan 3 hours including a 2 hour chill.
Can I use frozen blueberries?
Yes. Use thawed and drained blueberries, or toss partially thawed berries in a little flour to prevent them from sinking.
Can I assemble the casserole the night before?
Absolutely. Cover and refrigerate overnight. Baking the next morning makes brunch easy and frees up time for other dishes.
How do I tell when it is fully cooked?
The top should be golden and slightly puffed. Insert a knife into the center; it should come out mostly clean with only a few moist crumbs.
Is this safe to reheat and store?
Yes. Store in the refrigerator in an airtight container for up to 4 days. Reheat thoroughly until steaming hot. Freeze wrapped portions for up to 2 months.
Blueberry French Toast Casserole
Ingredients
Method
- Preheat the oven to 350°F (175°C) and butter a 9 by 13 inch baking dish.
- Cut the bread into 1 to 1.5 inch cubes. Keep the crusts on for texture.
- Spread half the bread cubes in the bottom of the prepared dish. Scatter half the blueberries over the bread.
- Add the remaining bread cubes on top and sprinkle the rest of the blueberries evenly.
- In a medium bowl, whisk the eggs, milk, sugar, vanilla, and cinnamon until smooth and blended.
- Pour the egg mixture evenly over the bread and blueberries. Press gently with a spatula so the bread soaks up the custard.
- Cover the dish and refrigerate for at least 2 hours or overnight for best texture.
- When ready to bake, remove the cover. Bake for 30 to 35 minutes until the top is golden and the center is set.
- A knife inserted in the middle should come out mostly clean.
- Let the casserole cool for 5 to 10 minutes before serving. Dust with powdered sugar if you like.
