Making the Best Blueberry French Toast Casserole involves simple steps that create a beautiful dish. Follow these instructions:

1. Prepare the Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray.
2. Layer the Bread: Evenly distribute the cubed French bread in the baking dish.
3. Add Blueberries: Sprinkle fresh blueberries evenly over the bread cubes.
4. Mix the Egg Mixture: In a large bowl, whisk together the eggs, milk, heavy cream, granulated sugar, vanilla extract, cinnamon, and salt until well combined.
5. Pour Over Bread: Pour the egg mixture over the bread and blueberries, ensuring all pieces are coated.
6. Press and Soak: Press down gently on the bread to help it absorb the mixture. Cover and refrigerate for at least 4 hours or overnight.
7. Preheat the Oven: Preheat your oven to 350°F (175°C).
8. Bake: Remove the casserole from the refrigerator and let it sit at room temperature for about 15 minutes. Bake in the preheated oven for 40-45 minutes, or until golden brown and set in the center.
9. Cool Slightly: Once out of the oven, allow the casserole to cool for a few minutes before slicing.
10. Garnish: Dust lightly with powdered sugar if desired and serve warm.

Follow these steps carefully, and you will have a gorgeous casserole that’s as enjoyable to make as it is to eat!