Overnight Biscoff French Toast Casserole

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Overnight Biscoff French Toast Casserole is my answer to those mornings when everyone wakes up hungry, but I am not in the mood to stand at the stove flipping bread slice by slice. You know the vibe, you want something cozy and sweet, but you also want to sip your coffee and pretend you are relaxing. This casserole lets you do the work ahead of time, then bake it while you get ready. The flavor is warm and spiced, and the top turns a little crisp while the inside stays soft and custardy. It also makes your kitchen smell like a bakery, which never hurts.

The Story Behind This Recipe

Hey, I’m Alexandraa! This Overnight Biscoff French Toast Casserole was built for busy nights: simple steps, reliable results, and flavor that makes people ask for seconds. Overnight Biscoff French Toast Casserole is my answer to those mornings when everyone wakes up hungry, but I am not in the mood to stand at…

Alexandraa

Why You Should Make This Casserole

If you have ever tried to make french toast for a group, you know it is basically a tiny chaos festival. This casserole takes that same comfort and turns it into a hands off bake. I make it for slow weekends, brunch with friends, and honestly, for random weekdays when I need a little joy.

Here is why I keep coming back to it:

• Make ahead friendly, so your morning is easy.
• Big batch, which means everyone eats at the same time.
• Biscoff flavor gives it that caramelized cookie taste without needing a lot of extras.
• Great texture, soft in the middle with a golden top.

If you love baked french toast casseroles in general, you might also like this cozy cousin recipe I have saved for holiday mornings: Cinnamon Roll French Toast Casserole. Different flavor, same happy situation.

One more little tip from my kitchen: use bread that is a bit stale if you can. Fresh bread works, but slightly dry bread drinks up that custard better and bakes up less soggy.

How to Make the French Toast Soaking Liquid

This is the part that makes the whole dish taste like real french toast and not just baked bread. The soaking liquid is basically a sweet custard, plus that signature Biscoff goodness.

What you need is simple, and you probably have most of it already:

• Eggs
• Milk (dairy or non dairy)
• Brown sugar or maple syrup
• Vanilla
• Cinnamon and a pinch of salt
• Biscoff cookie butter

My method is easy. I warm the cookie butter just a little so it mixes smoothly. Not hot, just soft. Then I whisk it into the milk, add eggs, and keep whisking until it looks even. You do not want big streaks of egg white or clumps of cookie butter. If you are using plant milk, oat milk is especially nice here because it already has that gentle sweetness.

I also like a tiny pinch of salt even though it is a sweet dish. It makes the flavors pop and keeps everything from tasting flat. This soaking liquid is the reason Overnight Biscoff French Toast Casserole tastes like dessert, but still counts as breakfast in my house.

And if you are the kind of person who loves an extra crunchy bite for dipping, you should peek at these for another morning: Cinnamon French Toast Sticks. They are fun, especially if kids are around.

Assembling the French Toast Casserole

This is the satisfying part because it comes together fast. Grab a baking dish, lightly grease it, and start layering.

Here is exactly how I do it:

• Cut your bread into chunks. Think bite sized, not tiny crumbs.
• Spread half the bread in the dish.
• Dollop spoonfuls of cookie butter across the bread. I do not try to be perfect about it.
• Add the rest of the bread.
• Pour the soaking liquid slowly over everything.
• Press the bread down gently so it actually absorbs the custard.

If you want to add Biscoff cookies, this is the moment. I crush a few and sprinkle them on top. They soften a bit overnight, then bake into a sweet, spiced topping.

Now, a quick reality check tip: if you see a couple of dry corners after pouring, just spoon a little extra liquid from the middle over those spots. Bread can be dramatic and soak unevenly.

This is also where I usually cover it and slide it into the fridge. Once it is tucked in, I feel like my future self gets a gift.

Totally random, but if you are planning a full comfort food menu for guests and want something savory later, I have made this alongside brunch leftovers for dinner before: French Onion Chicken Noodle Casserole. Different meal, same cozy energy.

I made this for a family brunch and everyone asked for the recipe. The top was perfectly crisp, and the inside tasted like a cookie flavored custard. I loved that I could prep it the night before and actually enjoy my coffee.

When you are ready to bake, take it out while the oven preheats. Bake until the center is set and the top is golden. If the top browns too fast, just loosely cover it with foil and keep baking until the middle is no longer wet.

Customizing the Baked Vegan French Toast

Let’s talk about swaps, because people always ask if this can be made vegan. Yes, you can absolutely do a baked vegan version and still keep it delicious.

Here is what works well:

• Swap eggs for a mix of ground flax and water, or use a vegan liquid egg replacer.
• Use oat milk, almond milk, or soy milk.
• Make sure your bread is vegan friendly.
• Use a plant based butter or coconut oil to grease the dish.

A small heads up from my trial and error: vegan versions sometimes bake a little softer, so give it a few extra minutes in the oven and let it sit before slicing. That resting time matters. It helps it firm up so you are not scooping it out like pudding, unless you want to, no judgment.

You can also customize the flavors without changing the whole plan:

• Add sliced bananas for a creamy sweet layer.
• Toss in chocolate chips for dessert vibes.
• Sprinkle chopped nuts for crunch.

I keep coming back to the classic cookie butter plus cinnamon combo because it tastes like the heart of Overnight Biscoff French Toast Casserole, but you can totally make it your own.

Also, if you are feeding a crowd with mixed cravings and want a savory dish to balance the sweetness, I have bookmarked this one for potlucks: French Onion Chicken Orzo Casserole. It is comforting in a totally different way.

Can I Prepare This Casserole the Night Before?

Yes, and honestly, that is the whole magic. Overnight Biscoff French Toast Casserole is at its best when it has time to soak. The bread absorbs the custard, the flavors settle in, and baking feels almost too easy the next day.

Here is my simple overnight plan:

• Assemble everything the night before.
• Cover tightly and refrigerate for at least 6 hours, or up to about 12 hours.
• In the morning, let it sit on the counter while the oven heats.
• Bake and let it rest before serving.

If you are doing this for a holiday morning, I recommend measuring everything out before bed too. It sounds extra, but it makes the evening prep feel calm. And if you are into the overnight french toast casserole life, you might also love this one: Overnight Pecan Pie French Toast. It is sweet, nutty, and super brunchy.

Storage is easy. Leftovers go in the fridge for a few days. Reheat slices in the oven or air fryer if you want the top to crisp back up. Microwave works too, but it will be softer.

Common Questions

What kind of bread works best?

Brioche and challah are my favorites, but any thick bread works. Slightly stale bread is even better because it soaks without turning mushy.

Do I have to use Biscoff cookies and cookie butter?

Cookie butter is the main flavor, so I would not skip it. The crushed cookies are optional, but they add a fun topping and a little extra spice.

How do I know when it is done baking?

The top should be golden and the center should look set, not jiggly wet. If you insert a knife in the middle, it should come out mostly clean, not coated in liquid custard.

Can I freeze it?

Yes. You can freeze baked portions. Wrap them well and freeze for up to a couple months. Thaw in the fridge and reheat in the oven for best texture.

What should I serve with it?

Fresh berries, sliced bananas, or a simple yogurt bowl are great. If you want maximum sweetness, a drizzle of warm cookie butter on top is hard to beat.

A cozy breakfast worth planning for

If you want a breakfast that feels special without a ton of morning effort, Overnight Biscoff French Toast Casserole really delivers. You prep it once, let the fridge do the work, then bake it into something warm and comforting. I love how it is simple, flexible, and still feels like a treat. If you are craving more baked french toast inspiration, I have also drooled over this recipe for Biscoff and Salted Caramel Chocolate Baked French Toast and it is seriously bookmark worthy. Try this casserole once, and I bet it will become one of your go to brunch saves too.