Cooking Instructions:
Begin by cutting the bread into cubes and placing them in a 9x13 inch pan. Alternate layers of bread cubes and fresh blueberries throughout the pan.
In a large mixing bowl, whisk together the eggs, milk, sweetener, vanilla extract, and cinnamon until well combined. Pour this custard mixture evenly over the layered bread and blueberries, ensuring all pieces are soaked.
Cover the casserole with aluminum foil and refrigerate for at least 30 minutes, or preferably overnight, to allow the bread to absorb the custard.
Preheat your oven to 350°F (175°C). If desired, sprinkle cinnamon sugar on top of the casserole before baking to add a crunchy texture.
Bake the casserole in the preheated oven for 45-50 minutes, or until the top is slightly toasted. For a crispier top, remove the foil during the last 20-30 minutes of baking.
Once baked, remove from the oven and let it cool slightly. Serve warm with maple syrup and a dusting of powdered sugar, and consider adding additional blueberries or blueberry sauce as a topping.