Baked French Toast Casserole

This creamy baked French toast casserole features a rich, velvety custard center, golden crispy edges, and a beautiful dusting of powdered sugar.

Why This Recipe Works:

• Stale brioche has a tight, sturdy crumb that absorbs custard without collapsing into mush.
• The precise ratio of whole milk to heavy cream creates a rich, velvety protein matrix that sets beautifully.
• Baking at a moderate temperature ensures the center cooks through before the sugar-rich edges burn.

Three years ago, I tried to impress my new sister-in-law with a fancy Sunday brunch, only to present her with a baking dish filled with what looked like hot, sweet cement that got annoying fast to clean.

The top was burnt to a crisp. But the center was pure, unbaked liquid custard.

Bear with me here, because the physics of this is simple. Standard bread slices lack the structural integrity to hold up under a heavy custard bath, leading to rapid starch gelatinization where the bread dissolves into mush before the oven's heat can coagulate the egg proteins. Pre-sliced sandwich loaf failed every single test because it lacks the tight crumb needed to absorb liquid without collapsing.

Enter stale brioche.

Stale brioche is the ultimate sponge. Pressing the bread cubes down with your bare hands until the custard squishes between your fingers ensures every single nook gets saturated.

For individual portions, try our baked French toast muffins. They are incredibly convenient for busy mornings.

Baked French Toast Casserole

• Publisher Storied Skillet
• Cuisine American
• Category Breakfast, Brunch
• Prep Time 20 mins
• Cook Time 45 mins
• Servings 8
• Calories 380 calories
• Rating 4.8 3746
• Tags baked french toast, breakfast casserole, brioche french toast, brunch recipe

Ingredients

• 1 loaf (about 1 pound) day-old brioche bread, cut into 1-inch cubes
• 6 large eggs
• 2 cups whole milk
• 1 cup heavy cream
• 1/2 cup granulated sugar
• 1 tablespoon vanilla extract
• 1 teaspoon ground cinnamon
• 1/4 teaspoon ground nutmeg
• 1/2 teaspoon Diamond Crystal kosher salt
• 2 tablespoons unsalted butter, melted (for greasing)
• Powdered sugar, for dusting

Directions

1. Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish with the melted butter.
2. Arrange the cubed brioche bread evenly in the prepared baking dish, pressing down gently to fit.
3. In a large bowl, whisk together the eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, nutmeg, and Diamond Crystal kosher salt until completely smooth and combined.
4. Pour the egg mixture evenly over the bread cubes, making sure every piece of bread gets coated. Use a spatula to gently press the bread down into the liquid.
5. Let the casserole sit at room temperature for 15 minutes (or cover and refrigerate overnight) so the bread can fully absorb the custard.
6. Bake uncovered for 40 to 45 minutes, until the center is set and the top is golden brown and slightly puffed.
7. Remove from the oven, let cool for 5 minutes, then dust generously with powdered sugar before slicing and serving.

Notes

• We use Diamond Crystal kosher salt here; if you are using Morton's kosher salt or fine table salt, cut the volume in half (use 1/4 teaspoon) to avoid an overly savory custard.
• The ratio of whole milk to heavy cream is crucial. Heavy cream introduces fat that coats the starch molecules in the bread, preventing them from over-gelatinizing and turning into mush, while ensuring a rich, velvety protein matrix.
• Keep a close eye on the oven during the last 10 minutes of baking. If the top edges of the brioche start to darken too quickly, tent the dish loosely with aluminum foil to prevent the sugar in the bread from burning before the center sets.
• After a day in the fridge, the leftovers will compress slightly as the custard fully sets. Reheating it in the oven or air fryer will revive the crispy edges, whereas the microwave will make it soft and damp.

Serving Suggestions

To turn this cozy casserole into a spectacular weekend spread, you only need a few simple accompaniments to balance the rich, sweet custard.

• Warm pure maple syrup served in a small pitcher for easy drizzling.
• A bowl of fresh mixed berries (raspberries, blueberries, and blackberries) to add a bright, tart contrast.
• Crispy bacon strips or savory breakfast sausage links to balance the sweetness.
• A dollop of lightly sweetened whipped cream or Greek yogurt on each slice.
• A fresh pot of hot coffee or a refreshing iced blueberry crumble latte to round out the morning.

Storage and Reheating

If you somehow end up with leftovers, don't panic. This casserole actually holds up surprisingly well in the fridge for up to three days, provided you cover it tightly with wrap.

The custard will continue to set. This makes the slices firmer and much easier to cut when cold.

Never use the microwave to reheat this.

Instead, pop individual slices into a 350°F oven or an air fryer for about five to eight minutes. This circulating dry heat coaxes the butter in the brioche back to life, restoring those coveted crispy, golden edges.

Ingredient Substitutes

If you don't have everything on hand, here are the best swaps that won't ruin the texture:

1. Brioche: Challah or thick-cut French bread work beautifully. If you have leftover bread that isn't brioche, you might want to save it for moist banana bread instead.
2. Heavy Cream: You can use all whole milk, but the custard will be slightly less rich and a bit more prone to weeping.
3. Granulated Sugar: Light brown sugar can be substituted for a deeper, caramel-like flavor profile.
4. Diamond Crystal Kosher Salt: Use half the amount of fine table salt or sea salt.

Let me know if you make this for your next family gathering—and if you want another fun breakfast project, check out our crispy French toast roll-ups!