I first tried this Overnight French Toast Bake on a sleepy weekend and it instantly became my go-to for easy brunches and holiday mornings. Cubes of tangy sourdough soak in a cinnamon-scented custard overnight, then bake into a golden, custardy casserole that feeds a crowd with almost no morning fuss. If you like make-ahead comfort breakfasts, this version sits in the fridge overnight and rewards you with warm, maple-drizzled slices the next day — similar in spirit to a cinnamon roll casserole I often turn to for company breakfasts that cinnamon roll French toast bake shows how simple transforms into special.

Why you’ll love this dish

This recipe hits the sweet spot between effortless and impressive. It saves time on busy mornings because you do the prep the night before. It stretches easily to feed a family or a group without extra hands in the kitchen. Using sourdough gives the casserole a pleasant tang and firm texture that holds up to the custard without turning soggy. Plus, it’s very forgiving: measure loosely, tweak spices, and the bake still turns out rich and satisfying.

"The custard soaks in overnight and bakes up golden the next morning — no flipping, no fuss, only maple-drizzled happiness."

Step-by-step overview

Before you start, here’s the quick flow so you know what to expect. Cube day-old sourdough, whisk a simple egg-and-milk custard with cinnamon and vanilla, pour it over the bread, then chill it covered overnight. In the morning, add a sprinkle of cinnamon sugar and dots of butter, then bake until the center sets and the top is golden. Finish with maple syrup and serve warm.

Gather these items

• 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)
• 1/3 cup granulated sugar (adjust to taste)
• 2 teaspoons vanilla extract
• 2 tablespoons butter, cut into small pieces for dotting before baking
• Pure maple syrup for serving

Notes on swaps: use half-and-half or a mix of milk and cream for extra richness. If you prefer less sugar, reduce to 2 tablespoons and rely on syrup at the table.

Directions to follow

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
2. Cut the sourdough into roughly 1-inch cubes and spread them evenly in the prepared dish.
3. In a medium bowl, whisk the eggs, milk, 1 teaspoon cinnamon, sugar, and vanilla until smooth. Pour the custard evenly over the bread, pressing lightly so the cubes absorb the liquid.
4. Cover the dish with plastic wrap or a lid and refrigerate overnight so the bread soaks up the custard.
5. The next morning, uncover and sprinkle the top with the remaining cinnamon and a little extra sugar. Dot with the small pieces of butter.
6. 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.
7. Let it rest 5 minutes, then cut into squares and serve warm with a generous drizzle of maple syrup.

Best ways to enjoy it

Serve slices straight from the pan with warmed maple syrup and a dusting of powdered sugar if you like. For a brunch spread, add fresh berries, a bowl of yogurt, or a simple green salad to cut through the sweetness. For a cozy twist, top each serving with toasted nuts or a scoop of vanilla ice cream for dessert-style indulgence. If you want bite-sized treats for a party, check out a different approach to portioning and presentation with these bite-sized French toast treats that translate the same flavors into finger food.

How to store & freeze

Cool leftover slices completely before storing. Refrigerate in an airtight container for up to 3 days. Reheat individual portions in the microwave for 30 to 60 seconds or warm slices in a 350°F oven for 8 to 10 minutes until heated through. To freeze, wrap individual squares tightly in plastic wrap and place in a freezer bag for up to 2 months. Thaw in the fridge overnight before reheating. Always discard refrigerated leftovers after 3 to 4 days to stay safe.

Pro chef tips

• Use day-old or lightly stale sourdough so the cubes absorb custard without collapsing.
• Let the custard sit a few minutes after whisking so any foam settles; this yields a smoother texture.
• Press the bread gently into the custard to encourage even soaking, but don’t mash it.
• If the top browns too quickly, tent loosely with foil halfway through baking.
• For a richer custard, swap 1/2 cup of milk for cream or use whole milk.
• Check doneness by inserting a skewer in the center; it should come out mostly clean with a few moist crumbs.

Flavor swaps

• Apple-cinnamon: fold in 1 peeled and diced apple and a pinch of nutmeg.
• Berry and lemon: stir fresh or frozen berries into the bread before baking and add 1 teaspoon lemon zest to the custard.
• Nutty crunch: sprinkle chopped pecans or walnuts on top in the last 10 minutes of baking.
• Dairy-free: use a plant-based milk like oat or almond and an egg replacer if needed; texture will be lighter.
• Brown sugar and spice: swap granulated sugar for brown sugar and add a pinch of allspice for a warmer profile.

Helpful answers

How long does the overnight soak need to be?

Overnight is ideal — 8 to 12 hours gives the bread time to fully absorb the custard. If you’re short on time, a 1 to 2 hour soak at room temperature will still work, but the center may be less custardy.

Can I prepare this the morning I want to serve it?

Yes. If you skip the overnight step, allow the bread to sit in the custard for at least an hour. Expect slightly different texture: the inside will be less fully saturated but still tasty.

Is it safe to refrigerate the assembled dish overnight?

Absolutely. Cover the dish and refrigerate promptly. The eggs are cooked only when baked, so keep the casserole chilled until you put it in the oven. Do not leave it at room temperature for extended periods.

Can I make this gluten-free?

Yes. Use a gluten-free sourdough-style loaf or other sturdy gluten-free bread. Texture will vary, so choose a loaf that holds up to soaking.

How do I know when the bake is done?

The edges should pull away slightly from the dish and the top should be golden. A skewer or knife inserted in the center should come out mostly clean with a few moist crumbs. If you use a thermometer, aim for an internal temperature around 165°F.

Overnight French Toast Bake

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A make-ahead French toast bake with sourdough bread soaked in a cinnamon custard, baked to perfection and served warm with maple syrup.

• Prep Time: 15 minutes
• Cook Time: 40 minutes
• Total Time: 55 minutes
• Yield: 8 servings 1x
• Category: Breakfast
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

Scale 1x2x3x

• 1 loaf sourdough bread (stale or a day old is best)
• 6 large eggs
• 2 cups milk (whole or 2% work fine)
• 2 teaspoons ground cinnamon (divided)
• 1/3 cup granulated sugar (adjust to taste)
• 2 teaspoons vanilla extract
• 2 tablespoons butter, cut into small pieces for dotting
• Pure maple syrup for serving

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Instructions

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
2. Cut the sourdough into roughly 1-inch cubes and spread them evenly in the prepared dish.
3. In a medium bowl, whisk the eggs, milk, 1 teaspoon cinnamon, sugar, and vanilla until smooth. Pour the custard evenly over the bread, pressing lightly to absorb the liquid.
4. Cover the dish with plastic wrap or a lid and refrigerate overnight.
5. The next morning, uncover and sprinkle the top with remaining cinnamon and a little extra sugar. Dot with small pieces of butter.
6. Bake for 30 to 40 minutes, until the top is golden and the center is set but slightly custardy.
7. Let it rest for 5 minutes, then cut into squares and serve warm with maple syrup.

Notes

For extra richness, use half-and-half or a mix of milk and cream. Adjust sugar to taste; consider serving with syrup.

Nutrition

• Serving Size: 1 serving
• Calories: 400
• Sugar: 10g
• Sodium: 300mg
• Fat: 15g
• Saturated Fat: 6g
• Unsaturated Fat: 7g
• Trans Fat: 0g
• Carbohydrates: 50g
• Fiber: 2g
• Protein: 12g
• Cholesterol: 180mg