Creating Pumpkin French Toast Casserole is a breeze when you follow these straightforward steps:

1. Prepare the Bread: Cut the challah or brioche bread into 1-inch cubes and place them in a large mixing bowl.

2. Make the Custard: In a separate bowl, whisk together the pumpkin puree, eggs, whole milk, heavy cream, granulated sugar, vanilla extract, cinnamon, nutmeg, salt, and baking powder until well combined.

3. Combine Mixtures: Pour the pumpkin custard mixture over the bread cubes. Gently fold the bread into the mixture to make sure all cubes are soaked evenly.

4. Add Nuts: If using, fold in the chopped pecans or walnuts for added texture.

5. Transfer to Baking Dish: Grease a large baking dish (9×13 inch works well) and pour the bread mixture into it, spreading it out evenly.

6. Prepare the Topping: In a small bowl, combine brown sugar, flour, cinnamon, and melted butter. Mix until crumbly, then sprinkle evenly over the bread mixture in the baking dish.

7. Chill Overnight (Optional): Cover the dish with plastic wrap and refrigerate the casserole overnight. This step allows the bread to absorb the custard fully.

8. Preheat Oven: If you chilled the casserole overnight, preheat your oven to 350°F (175°C).

9. Bake: Place the casserole in the preheated oven and bake for 45-50 minutes, or until it’s golden brown and the custard is set.

10. Cool Slightly: Once baked, remove from oven and let it cool for about 10-15 minutes before serving.

11. Serve: Cut into squares and serve warm with maple syrup, powdered sugar, or whipped cream, if desired.

Following these steps will lead you to an amazing Pumpkin French Toast Casserole that you and your loved ones will cherish!