Creating your Blueberry Lemon French Toast Casserole is straightforward. Follow these steps for a delicious result:

1. Prepare the Bread: Start by cutting the French bread into 1-inch cubes. Place them in a large mixing bowl.

2. Add Blueberries and Lemon Zest: Gently fold in the fresh blueberries and lemon zest with the bread cubes, ensuring they are evenly distributed.

3. Make the Egg Mixture: In a separate bowl, whisk together the eggs, whole milk, granulated sugar, vanilla extract, ground cinnamon, salt, and fresh lemon juice until well combined.

4. Combine Mixtures: Pour the egg mixture over the bread and blueberries. Gently stir to ensure that all the bread cubes are soaked in the mixture.

5. Chill: Cover the bowl with plastic wrap and refrigerate for at least 2 hours, or overnight for the best flavor infusion.

6. Preheat the Oven: When you’re ready to bake, preheat your oven to 350°F (175°C).

7. Transfer to Baking Dish: Grease a 9×13-inch baking dish. Pour the soaked bread mixture into the dish, spreading it evenly.

8. Bake: Place in the preheated oven and bake for 45-50 minutes, or until the top is golden brown and a toothpick comes out clean.

9. Cool Slightly: Once baked, remove from the oven and let it cool for about 10 minutes.

10. Serve: Dust with powdered sugar and cut into squares. Serve warm with maple syrup if desired.

These simple steps will guide you through creating a delicious Blueberry Lemon French Toast Casserole that will wow your family and friends.