Easy Overnight Apple French Toast Casserole

This Apple French Toast Casserole is the kind of breakfast that feels special without any last-minute stress. Cubes of challah soak up a rich custard, layered with cinnamon-kissed apples, then everything bakes into a puffy, golden dish.

The best part? You assemble it the night before. In the morning, just slide it into the oven while you make coffee.

Why This Casserole Works

The bread soaks overnight, turning the center almost pudding-soft while the top gets crisp and caramelized.

The apples soften into jammy little pockets that cut through the richness.

It’s a completely hands-off morning that still feels like you fussed.

Ingredients

• 1 lb loaf day-old challah or brioche, cut into 1-inch cubes: day-old bread absorbs the custard without turning mushy
• 4 large eggs
• 2 cups whole milk
• 1/2 cup heavy cream
• 1/2 cup packed light brown sugar
• 1 tsp vanilla extract
• 1 tsp ground cinnamon
• 1/4 tsp ground nutmeg
• Pinch of salt
• 2 medium apples (like Granny Smith or Honeycrisp), peeled and sliced 1/4 inch thick
• 3 tbsp unsalted butter
• 2 tbsp packed light brown sugar, for the apples
• Warm maple syrup, for serving
• Powdered sugar, for dusting (optional)

Variations / Substitutions

• Bread swap: sourdough or a sturdy gluten free loaf work, though the texture will be a bit chewier.
• Apple swap: pears slice up the same way and give an equally tender, sweet note.
• Dairy free: use unsweetened oat milk and a thick dairy free cream alternative, plus a vegan buttery spread.
• Add crunch: scatter 1/2 cup chopped pecans over the top just before baking.

Pumpkin French Toast is next on our list if this french toast casserole is your kind of breakfast.

How to Make Apple French Toast Casserole

Step 1: Sauté the Apples

Melt the 3 tablespoons butter in a large skillet over medium heat. Add the sliced apples and 2 tablespoons brown sugar, then cook, stirring occasionally, for about 5 minutes, just until they start to soften and the sugar melts into a light glaze. You are not cooking them through, they’ll finish in the oven.

The apples will look glossy and slightly tender when you press a slice with the back of a spoon, and the kitchen will already smell like a bakery.

Step 2: Whisk the Custard

In a large bowl, whisk together the 4 eggs, 2 cups milk, 1/2 cup heavy cream, 1/2 cup brown sugar, vanilla, cinnamon, nutmeg, and salt. Keep going for about a minute, until the sugar dissolves and the spices are evenly dispersed.

The custard should be smooth and pale tan, with no streaks of egg white. Getting it fully blended now means a consistent, silky texture after baking.

Step 3: Assemble and Soak

Scatter half of the challah cubes into a buttered 9×13 inch baking dish. Spoon half of the sautéed apples over the bread. Repeat with the remaining bread and apples, then slowly pour the custard all over the top. Press down gently with a spatula so the bread drinks up the liquid. Cover tightly and refrigerate for at least 4 hours, or ideally overnight.

As it chills, the bread absorbs nearly every drop of custard. The next morning the pieces will look swollen and soft, and the dish will feel heavy—exactly what you want for a rich, custardy center.

Step 4: Bake the Casserole

Preheat the oven to 350°F (175°C). Take the dish out of the fridge while the oven heats. Remove the plastic wrap and bake uncovered for 45 to 50 minutes. The casserole is done when the top is deeply golden and a knife inserted in the center comes out clean.

If the top browns too fast, tent it loosely with foil for the last 10 minutes. The whole thing will settle a bit once out of the oven; that’s normal and part of the charm.

Step 5: Drizzle and Serve

Let the casserole rest for 5 minutes, then cut into squares. Drizzle generously with warm maple syrup and dust with powdered sugar if you like. Serve while still hot, with extra syrup on the side.

That first bite gives a crisp, sugary top, soft eggy bread, then a sweet burst of apple. No one will guess how little you actually did that morning.

Tips for the Best Apple French Toast Casserole

• Start with day-old bread. Fresh challah turns too mushy; leave slices out overnight or lightly toast cubed bread in a 300°F oven for 5 minutes first.
• Use a mix of tart and sweet apples. Combining Granny Smith with Honeycrisp keeps the flavor balanced and stops it from tasting too sugary.
• Place the baking dish on a sheet pan. It catches any custard that bubbles over, saving your oven floor.
• Press the bread down again after you pour the custard. A second gentle press 10 minutes into the soak helps every cube absorb evenly.

Bake times can shift a bit based on your baking dish:

Storing Leftover Casserole

• Refrigerator: Cover leftover squares tightly and keep them in the fridge for up to 3 days.
• Reheating: Warm individual portions in the microwave for 1 minute, or reheat the whole dish covered at 300°F (150°C) for about 15 minutes so it stays soft.

What to Serve with This Casserole

Crisp bacon or breakfast sausage cuts through the sweetness perfectly. A bowl of fresh berries and a glass of cold orange juice round out a complete brunch spread.

Frequently Asked Questions

Can I use a different type of bread?

Yes, any sturdy loaf like French bread or sourdough works. Avoid soft sandwich bread, which becomes mushy.

Do I have to let it soak overnight?

An overnight rest is ideal, but even 4 hours in the fridge delivers great results. The longer soak simply deepens the custard texture.

Can I freeze this casserole?

Freeze the unbaked, assembled casserole (before adding custard) for up to a month. Thaw overnight in the fridge, pour the custard over, soak at least 4 hours, and bake.

Can I make this dairy free?

Yes, swap the milk and cream for unsweetened oat milk and a thick dairy free cream alternative. Use a vegan buttery spread for the apples.

Apple French Toast Casserole Recipe

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 50 minutes mins

Total Time 1 hour hr 10 minutes mins

Servings: 8 servings

Calories: 380

Ingredients Method Notes

Ingredients

  

• 1 lb loaf day-old challah or brioche, cut into 1-inch cubes
• 4 large eggs
• 2 cups whole milk
• 1/2 cup heavy cream
• 1/2 cup packed light brown sugar
• 1 tsp vanilla extract
• 1 tsp ground cinnamon
• 1/4 tsp ground nutmeg
• Pinch of salt
• 2 medium apples, peeled and sliced 1/4 inch thick
• 3 tbsp unsalted butter
• 2 tbsp packed light brown sugar
• Warm maple syrup, for serving
• Powdered sugar, for dusting (optional)

Method

 

1. Melt butter in a skillet over medium heat. Add apples and 2 tablespoons brown sugar; cook 5 minutes until just softened.
2. Whisk eggs, milk, cream, 1/2 cup brown sugar, vanilla, cinnamon, nutmeg, and salt until smooth.
3. Layer half the bread and apples in a buttered 9×13 dish. Repeat, then pour custard over everything. Press down, cover, and refrigerate at least 4 hours or overnight.
4. Preheat oven to 350°F (175°C). Uncover and bake 45-50 minutes until puffed, golden, and a knife inserted in the center comes out clean.
5. Rest 5 minutes, cut into squares, drizzle with warm maple syrup, and dust with powdered sugar if using. Serve hot.

Notes

The casserole needs at least a 4 hour soak, but overnight is best. If it has chilled overnight, let it sit on the counter for 15 minutes before baking so it warms up slightly.