I make this Overnight French Toast Bake whenever I want a hands-off brunch that feeds a crowd and still tastes homemade. It’s a simple custard-soaked sourdough casserole that sleeps in the fridge and bakes into a golden, slightly custardy center. If you like make-ahead breakfast dishes, pair it with an easier fruit-forward cousin like this overnight blueberry French toast casserole for variety on busy mornings.
What makes this recipe special
This casserole is magic because it combines pantry-friendly ingredients into something that feels celebratory without much last-minute fuss. Stale sourdough soaks up a silky egg-and-milk custard, which creates crisp edges and a tender, custardy middle after baking. It’s budget-friendly, scales easily for a crowd, and is kid-approved — great for holiday mornings, weekend brunches, or a simple Sunday family breakfast.
“We served this at brunch and everyone went back for seconds. Golden on top, custardy inside, and the maple syrup made it feel indulgent.” — a regular tester
Step-by-step overview
You’ll quickly notice this recipe is mostly prep and patience. Cube the bread, whisk the custard, pour and press so the bread soaks. Refrigerate overnight so flavors deepen. The next morning you add a cinnamon-sugar sprinkle, dot with butter, then bake until the top is golden and the center is just set. Total hands-on time is about 15–20 minutes the night before and a 30–40 minute bake in the morning.
What you’ll need
- 1 loaf sourdough bread (stale or a day old is best)
- 6 large eggs
- 2 cups milk (whole milk gives the richest custard; 2% works fine)
- 2 teaspoons ground cinnamon, divided (use 1 tsp in custard, 1 tsp for topping)
- 1/3 cup granulated sugar, plus a little extra for sprinkling (adjust to taste)
- 2 teaspoons vanilla extract
- 2 tablespoons butter, cut into small pieces for dotting before baking
- Pure maple syrup for serving
Substitutions and notes: use challah or brioche for an even richer result. For dairy-free, swap milk with unsweetened oat or almond milk and use a vegan butter for dotting, though texture will be slightly different.
Step-by-step instructions
- Preheat oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
- Cut the sourdough into roughly 1-inch cubes and spread them evenly in the prepared dish.
- In a medium bowl, whisk the eggs, milk, 1 teaspoon cinnamon, sugar, and vanilla until smooth.
- Pour the custard evenly over the bread. Press the bread gently so the cubes begin to absorb the liquid.
- Cover the dish with plastic wrap or a lid and refrigerate overnight so the bread soaks up the custard.
- Next morning, uncover and sprinkle the top with the remaining cinnamon and a little extra sugar. Dot with the small pieces of butter.
- Bake for 30 to 40 minutes, until the top is golden and the center is set but still slightly custardy. A toothpick inserted in the center should come out mostly clean.
- Let rest for 5 minutes, then cut into squares and serve warm with a generous drizzle of maple syrup.
How to plate and pair
Serve warm squares straight from the pan or plate individual portions with a dusting of powdered sugar and plenty of maple syrup. For contrast, add fresh berries, a dollop of Greek yogurt, or a citrus compote. For a playful, portable option serve smaller squares with cinnamon roll French toast bites on the side for guests who want more sweet bites.
Storage and reheating tips
Cool leftovers to room temperature, then cover and refrigerate within two hours of baking. Store in the refrigerator for 3 to 4 days. Reheat individual portions in the microwave for 30–60 seconds, or warm in a 350°F oven for 10–15 minutes to revive the edges. To freeze, cut into squares, flash-freeze on a tray, then transfer to a freezer bag for up to 2 months. Thaw overnight in the fridge and reheat in the oven for best texture.
Food safety note: keep the soaked casserole refrigerated overnight at 40°F or below. Bake until the center is set; for extra assurance the internal temperature should reach about 160°F.
Pro chef tips
- Use stale bread: slightly dry bread soaks up custard without turning to mush.
- Cube uniformly: 1-inch cubes bake evenly.
- Press, but don’t drown: press the custard into the bread so it soaks, but avoid packing too tightly.
- Watch bake time: overbaking dries the custard. Aim for a golden top and a slightly jiggly center.
- Texture boost: sprinkle a teaspoon of raw sugar on top before baking for a crunchy finish.
Flavor swaps
- Fruit fold-ins: scatter thinly sliced apples or raspberries over the top before baking.
- Nutty crunch: add a streusel of brown sugar, flour, and chopped pecans or walnuts.
- Citrus lift: stir a teaspoon of orange zest into the custard for brightness.
- Dairy-free option: use a richer plant milk like oat and accept a slightly different texture.
- Extra rich: swap 1/2 cup of the milk for heavy cream for a creamier custard.
Common questions
How long does prep and bake take?
Hands-on prep is about 15–20 minutes. Refrigerate overnight (or at least 6 hours), then bake 30–40 minutes. Plan for about 8–10 hours total if you include chilling time.
Can I make this the morning of the event instead of overnight?
Yes, but allow at least 4 to 6 hours of chilling so the bread absorbs the custard. Overnight gives the best, custardy texture.
Can I use different bread?
Yes. Brioche or challah makes an especially rich dish; sourdough gives a pleasant tang. Avoid very soft sandwich loafs unless they are slightly stale.
Is it safe to refrigerate the custard-soaked bread overnight?
Yes, provided the dish is covered and refrigerated at 40°F or below. Store no longer than 24 hours before baking for best texture and safety.
How do I reheat leftovers without drying them out?
Reheat in the oven at 350°F for 10–15 minutes covered loosely with foil, or microwave in short bursts until just warmed.
Can I freeze the baked casserole?
Yes. Freeze individual squares for up to 2 months. Thaw overnight in the fridge and reheat in the oven for best results.
Overnight French Toast Bake
Ingredients
Method
- Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish with butter or nonstick spray.
- Cut the sourdough into roughly 1-inch cubes and spread them evenly in the prepared dish.
- In a medium bowl, whisk the eggs, milk, 1 teaspoon cinnamon, sugar, and vanilla until smooth.
- Pour the custard evenly over the bread. Press the bread gently so the cubes begin to absorb the liquid.
- Cover the dish with plastic wrap or a lid and refrigerate overnight so the bread soaks up the custard.
- Next morning, uncover and sprinkle the top with the remaining cinnamon and a little extra sugar. Dot with the small pieces of butter.
- Bake for 30 to 40 minutes, until the top is golden and the center is set but still slightly custardy. A toothpick inserted in the center should come out mostly clean.
- Let rest for 5 minutes, then cut into squares and serve warm with a generous drizzle of maple syrup.
