Creating Berry & Cream Cheese Stuffed French Toast Casserole is simple if you follow these steps:

1. Prepare the Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray.
2. Cube the Bread: Cut the loaf of challah or brioche into bite-sized cubes and place them in the prepared baking dish.
3. Make the Cream Cheese Filling: In a mixing bowl, beat the softened cream cheese until smooth. Add half of the berries and mix gently to combine.
4. Fill the Bread: Drop spoonfuls of the cream cheese mixture over the bread cubes, ensuring even distribution. Sprinkle the remaining berries on top.
5. Whisk the Egg Mixture: In another bowl, whisk together the eggs, milk, sugar, vanilla extract, cinnamon, and salt until well combined.
6. Pour the Egg Mixture: Carefully pour the egg mixture over the bread and cream cheese filling, ensuring all the bread is soaked.
7. Chill: Cover the baking dish with plastic wrap and refrigerate for at least 4 hours or overnight to allow the bread to absorb the custard.
8. Preheat the Oven: When ready to bake, preheat your oven to 350°F (175°C).
9. Bake the Casserole: Remove the plastic wrap and bake in the preheated oven for 30-35 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
10. Cool Slightly: Allow the casserole to cool for a few minutes before slicing.
11. Dust with Powdered Sugar: For an elegant touch, dust the top with powdered sugar before serving.