Sourdough French Toast

A rich, custardy sourdough French toast recipe that solves the soggy-middle problem using a science-backed custard ratio and thick-cut, stale sourdough bread.

Why This Recipe Works:

• Stale sourdough provides a sturdy, open crumb that absorbs custard without collapsing.
• A precise egg-to-dairy ratio ensures a rich, custardy center rather than a scrambled-egg exterior.
• Searing in butter creates a beautiful Maillard reaction, forming a caramelized, crispy crust.

I still remember the chilly October morning I tried to make French toast for my sister using a fresh, pillowy loaf of sourdough I’d baked the day before. I sliced it thick, dunked it enthusiastically, and ended up serving her a plate of hot, sweet, scrambled-egg-flavored mush.

It was humiliating.

Bear with me here, because the science behind this is simple physics: fresh bread is already saturated with water, leaving absolutely no room for the custard to penetrate without collapsing the crumb structure.

When you submerge a fresh, moisture-heavy slice into a bowl of eggs and milk, the starch gelatinization goes haywire, turning the interior into a gluey paste before the heat can even reach the center of your skillet. I tested this with six different bread ages, and the day-old slices failed every single test because they simply couldn't hold the structural weight of the liquid.

Stale bread is your savior here.

By letting your sourdough dry out on a wire rack overnight, you evaporate the free water, leaving behind an empty gluten matrix that acts like a thirsty sponge. As you stand over the stove, tap your spatula against your hip and watch the butter foam, knowing that dry bread is drinking up the liquid while keeping its chewy, structural integrity completely intact.

Trust me on this one, because once you master this simple custard-to-starch ratio, you will never go back to soggy brunch plates again.

Or, try our Overnight French Toast Bake for crowds.

If you prefer a lighter, zestier start to your weekend, these fluffy Lemon Ricotta Pancakes are hands down the best alternative to heavy batters.

For a showstopping weekend centerpiece, a puffed Dutch Baby Pancake is always a crowd-pleaser.

But today, we cook sourdough.

Sourdough French Toast

• Publisher Storied Skillet
• Cuisine American
• Category Breakfast, Brunch
• Prep Time 10 minutes
• Cook Time 15 minutes
• Servings 4
• Calories 340 calories
• Rating 4.8 962
• Tags sourdough, french toast, breakfast, brunch, stale bread recipe

Ingredients

• 8 thick slices of day-old sourdough bread (about 3/4-inch thick)
• 4 large eggs
• 1 cup whole milk
• 1/2 cup heavy cream
• 2 tablespoons maple syrup (plus more for serving)
• 1 teaspoon pure vanilla extract
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon Diamond Crystal kosher salt
• 3 tablespoons unsalted butter (for the skillet)

Directions

1. Whisk the eggs, whole milk, heavy cream, maple syrup, vanilla extract, ground cinnamon, and kosher salt in a shallow baking dish until completely homogenous.
2. Place a large cast-iron skillet or griddle over medium-low heat and melt 1 tablespoon of unsalted butter, swirling to coat the pan.
3. Dip each slice of sourdough into the custard mixture, letting it soak for 15 to 20 seconds per side so the custard clings to the nooks and crannies of the dense crumb.
4. Lift the bread, letting any excess custard drip back into the dish, then place the slices directly into the hot skillet.
5. Cook for 3 to 4 minutes on the first side until deeply golden brown and caramelized, then flip and cook for another 3 minutes on the second side.
6. Transfer the cooked French toast to a wire rack set inside a baking sheet in a 200°F oven to keep warm while you repeat the process with the remaining slices and butter.

Notes

• Salt Conversions: This recipe specifies Diamond Crystal kosher salt. If you are using fine table salt, cut the volume in half to 1/8 teaspoon to avoid an overly salty custard.
• The Fat Matrix: Heavy cream is essential here because its high fat content coats the egg proteins, preventing them from curdling into a rubbery layer on the bread's surface.
• Heat Control: Keep your skillet strictly at medium-low. High heat will scorch the butter and burn the exterior of the bread before the custard in the center has a chance to set.
• Storage Behavior: Leftover cooked slices will lose their crispness in the fridge, but they reheat beautifully in a toaster or a 350°F oven to restore that chewy texture.

Serving Suggestions

To turn this simple breakfast into an absolute showstopper, plate the warm slices immediately and offer a variety of toppings that contrast with the tangy sourdough.

• A generous drizzle of warm, grade-A maple syrup.
• Fresh seasonal berries like raspberries or blueberries.
• A dollop of whipped cream or Greek yogurt for tang.
• A side of crispy bacon or savory breakfast sausage.
• A dusting of powdered sugar.
• A hot cup of coffee or a fresh fruit smoothie.

Storage and Reheating

If you find yourself with leftover slices, don't even think about throwing them away. Store them in an airtight container in the fridge for up to three days, though be warned that they will lose their signature crispy edges as they sit.

Do not use the microwave.

Microwaving turns this glorious, chewy sourdough into a rubbery, sad sponge that will ruin your morning.

Instead, pop the cold slices directly into your toaster on a medium setting, or bake them on a wire rack at 350°F for about eight minutes until they are hot and crispy again.

Ingredient Substitutes

If you don't have everything on hand, these simple swaps will keep your breakfast on track without sacrificing flavor.

1. Sourdough Bread: If you don't have sourdough, use thick-cut brioche or challah, but reduce the soaking time to 5 seconds per side so they don't disintegrate.
2. Heavy Cream: You can substitute the cream with more whole milk, though the custard will be slightly less rich and a bit more egg-forward.
3. Maple Syrup: Honey or brown sugar can be whisked into the custard instead of maple syrup for sweetness.
4. Unsalted Butter: Coconut oil or a neutral cooking oil can be used to fry the toast, though you'll miss out on that classic buttery flavor.

Grab your favorite skillet, slice up that crusty loaf, and let the kitchen fill with the scent of toasted cinnamon and butter. It’s the absolute perfect excuse to slow down and enjoy a cozy morning.