Overnight Baked French Toast Casserole

Step-by-Step Instructions

Prep the Baking Dish: Lightly grease a $9 \times 13$ inch or a $7 \times 11$ inch baking dish. The smaller size will result in thicker, taller pieces (like in the image).
Arrange the Bread: Arrange the slices of bread tightly in the prepared dish. The pieces should fit snugly together.
Make the Custard: In a large bowl, whisk together the eggs, whole milk, heavy cream, sugar, vanilla extract, cinnamon, and salt until the mixture is smooth and slightly frothy.
Pour and Soak: Pour the egg custard evenly over the bread slices, making sure all the pieces are thoroughly saturated.
Cover and Chill: Cover the baking dish tightly with plastic wrap or aluminum foil. Refrigerate for a minimum of 4 hours, but preferably overnight (10-12 hours) to allow the bread to fully absorb the liquid.

Preheat and Prep: The next morning, preheat your oven to $175^{\circ}\text{C}$ ( $350^{\circ}\text{F}$ ). Take the French Toast casserole out of the refrigerator and let it sit on the counter while the oven preheats.
Prepare the Glaze/Caramel: In a small, microwave-safe bowl, combine the 4 tablespoons of melted butter and the $1/4$ cup of maple syrup. Whisk until fully combined.
Pour Topping: Pour the butter-maple syrup mixture evenly over the top of the soaked bread. This step is crucial for achieving the glossy, caramelized finish seen in the photograph.
Bake: Bake uncovered for 35 to 45 minutes. The French toast is done when it is golden brown on top, puffed up slightly, and the custard is set (the center should not jiggle when the pan is lightly shaken).

Rest: Remove the casserole from the oven and let it rest for 5-10 minutes. This helps the pieces set and cool slightly.
Garnish: For the best presentation, dust the entire casserole lightly with powdered sugar, as shown in the photo, right before serving.
Serve: Slice and serve the baked French toast warm with extra maple syrup, fresh berries, and a dollop of whipped cream or crème fraîche.

Fruit Toppings: Add fresh berries (strawberries, blueberries), sliced bananas, or sautéed apples during the last 10 minutes of baking.
Nutty Crunch: Sprinkle chopped pecans or walnuts over the top before baking for added texture.
Cream Cheese Swirl: Drop small spoonfuls of a softened cream cheese and sugar mixture into the gaps between the bread slices before pouring the custard for a decadent, creamy surprise.