Cinnamon French Toast Casserole

The Cinnamon French Toast Casserole is the brunch dish that lets you actually enjoy your own party. It's assembled the night before, refrigerates until morning, and bakes while guests arrive — filling the house with the kind of cinnamon-vanilla fragrance that makes everyone feel immediately at home. The result is a puffed, golden-crowned casserole that cuts into custardy, bread-pudding-like squares with caramelized edges. It is simultaneously the most effortless and most crowd-pleasing thing you can put on a brunch table.

The concept is essentially a baked bread pudding in the French toast tradition — thick-cut brioche or challah soaked in a richly spiced custard, refrigerated overnight, then baked until deeply golden with a streusel top that caramelizes into a shatteringly crisp crust. It serves twelve and takes twenty minutes of actual effort.

About the Bread

Brioche is the gold standard for French toast casseroles — its high butter and egg content produce a richer, more custardy result than regular bread. Challah is an excellent alternative with similar results. Day-old bread is strongly preferred: fresh bread holds less custard and tends to turn mushy. If you only have fresh bread, spread the cubed pieces on a baking sheet and dry them in a 300°F oven for 20 minutes.

King Arthur Baking provides an excellent overview of custard ratios for bread pudding applications (King Arthur Baking).

Ingredients (serves 10–12): - 1 large brioche loaf (about 1½ lbs), cut into 1½-inch cubes (about 10 cups) - 6 large eggs - 2½ cups whole milk - ½ cup heavy cream - ½ cup granulated sugar - 3 tablespoons brown sugar - 1 tablespoon vanilla extract - 2 teaspoons ground cinnamon - ½ teaspoon freshly grated nutmeg - ¼ teaspoon fine sea salt - 2 tablespoons unsalted butter, melted (for greasing the dish)

Streusel Topping: - ½ cup all-purpose flour - ½ cup packed light brown sugar - 1 teaspoon ground cinnamon - ¼ teaspoon fine sea salt - 6 tablespoons cold unsalted butter, cut into small cubes - ½ cup chopped pecans or walnuts (optional)

To Serve: - Warm pure maple syrup - Fresh berries (strawberries, blueberries, raspberries) - Powdered sugar for dusting - Cold crème fraîche or whipped cream (optional)

Assembly (Evening Before): Butter a 9×13-inch baking dish generously. Spread the cubed brioche evenly in the dish.

In a large bowl, whisk together eggs, milk, heavy cream, granulated sugar, brown sugar, vanilla, cinnamon, nutmeg, and salt until completely smooth. Pour the custard evenly over the bread cubes. Press the bread gently with your hands to encourage absorption. Every cube should be moistened.

Make the streusel: combine flour, brown sugar, cinnamon, and salt. Work in the cold butter cubes with your fingertips until the mixture resembles coarse crumbles with some pea-sized pieces remaining. Stir in nuts if using. Scatter the streusel evenly over the soaked bread.

Cover the dish tightly with plastic wrap and refrigerate for a minimum of 4 hours — overnight (8–12 hours) is ideal. The bread absorbs the custard completely and the streusel firms up in the cold.

Baking (Morning of): Remove the casserole from the refrigerator 20 minutes before baking. Preheat oven to 350°F.

Bake uncovered for 45–55 minutes until the top is deeply golden, the streusel is caramelized and crisp, and a knife inserted in the center comes out without liquid custard (the eggs should be fully set). If the top colors too quickly, tent loosely with foil for the last 10 minutes.

Let rest 5 minutes before cutting into squares and serving.

The Pairing: A Cinnamon French Toast Casserole alongside a classic orange mimosa or a blood orange mimosa is one of the finest brunch combinations — the citrus acidity cuts cleanly through the richness of the custard and the caramelized streusel.

Variations: - Apple Cinnamon Version: Fold 1½ cups peeled, diced apples into the bread before pouring the custard. - Blueberry Lemon Version: Reduce cinnamon to ½ teaspoon, add lemon zest to the custard, fold in 1 cup fresh blueberries. - Savory Version: Omit sugar and spices, add sharp cheddar, cooked bacon, and fresh chives — a completely different but equally excellent dish.

Reference Links: - Bread pudding ratios: Serious Eats - Brioche vs. challah guide: Food52

Pro Tips: The overnight rest is what separates a good casserole from an exceptional one — the bread fully absorbs the custard, the proteins align, and the baking results in a cohesive, sliceable texture. Do not skip it. Pull the casserole from the oven while the center still has a very gentle wobble — carryover heat finishes the setting, and the difference between perfect and overdone is 5 minutes.