Making Chocolate Chip Bread Pudding with Cream Sauce is straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter.
2. Prepare Bread: In a large mixing bowl, add the cubed day-old bread. Set aside.
3. Mix Custard Ingredients: In another large bowl, whisk together the eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, and salt until well combined.
4. Combine Mixtures: Pour the egg mixture over the bread cubes. Gently fold to ensure each piece of bread is soaked in the custard.
5. Add Chocolate Chips: Fold in the semi-sweet chocolate chips, distributing them evenly throughout the bread mixture.
6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it out evenly.
7. Bake: Place in the preheated oven and bake for 40-45 minutes, or until the top is golden and a knife inserted in the center comes out clean.
8. Cool: Once baked, remove from the oven and allow the bread pudding to cool for about 15-20 minutes before serving.
9. Prepare Cream Sauce: While the pudding is cooling, make the cream sauce by whisking together heavy cream, powdered sugar, and vanilla extract in a bowl until smooth and fluffy.
10. Serve: Drizzle the cream sauce over warm bread pudding when ready to serve.