01 - Preheat oven to 350°F. Generously butter a 9x13-inch baking dish.
02 - Spread bread cubes evenly in the prepared dish. If using raisins, sprinkle them over the bread.
03 - In a large bowl, whisk together milk, cream, eggs, sugar, vanilla extract, cinnamon, nutmeg, and salt until fully combined.
04 - Pour the custard mixture evenly over the bread, pressing down lightly to ensure all cubes absorb liquid. Let stand for 10 minutes.
05 - Drizzle melted butter over the top of the soaked bread.
06 - Bake for 40–45 minutes until golden brown and set in the center. A knife inserted near the center should come out clean.
07 - While pudding bakes, combine milk, cream, sugar, and butter in a small saucepan. Heat over medium, stirring until sugar dissolves and mixture is hot but not boiling.
08 - Mix cornstarch and cold water in a small bowl to make a slurry. Stir into the hot sauce and cook, stirring constantly, until thickened (2–3 minutes).
09 - Remove from heat and stir in vanilla extract and salt.
10 - Serve warm bread pudding with generous spoonfuls of warm vanilla sauce spooned over each portion.