Preheat your oven to 350°F (175°C).
In a large bowl, whisk together the eggs, sugar, vanilla extract, cinnamon, nutmeg, and a pinch of salt.
Gradually add the milk, whisking continuously to create a smooth custard mixture.
Gently fold in the cubed bread until every piece is coated with the custard.
Allow the mixture to rest for 15 minutes, letting the bread soak up the delicious flavors.
If desired, sprinkle in the raisins for an extra burst of sweetness.
Transfer the mixture to a greased baking dish.
Bake for 45-50 minutes or until the top is golden brown and a toothpick comes out clean.