1. Lightly grease a 9×13-inch baking dish. Layer half of the bread cubes, followed by cream cheese cubes, and sprinkle blueberries on top. Finish with the remaining bread cubes.
2. In a large bowl, whisk together eggs, milk, vanilla, and syrup. Pour over the bread mixture. Cover and refrigerate overnight.
3. Remove from the fridge 30 minutes before baking. Preheat the oven to 350°F (175°C).
4. Bake covered for 30 minutes, then uncover and bake until firm and lightly browned, about 25-30 minutes.
5. For the sauce, combine sugar, water, and cornstarch in a saucepan. Bring to a boil, stirring constantly for 3-4 minutes. Add blueberries and simmer until they burst, about 10 minutes. Stir in butter.
6. Serve portions of casserole with warm blueberry sauce drizzled on top.

PREP TIME & NUTRITION:
Prep Time: 15 mins, Cook Time: 55 mins, Additional Time: 8 hrs 30 mins, Total Time: 9 hrs 40 mins
Servings: 10, Calories: 485, Net Carbs: 52g, Fats: 25g, Protein: 15g