Preheat & Prepare: Preheat oven to 180°C (350°F). Grease a baking dish.
Choose Your Bread: Tear or slice stale bread into chunks and place in the dish.
Prepare the Custard: In a bowl, whisk eggs, milk, sugar, vanilla extract, and cinnamon until combined.
Combine & Soak: Pour the custard mixture over the bread. Let it soak for 15-20 minutes.
Add Mix-Ins (Optional): Sprinkle chocolate chips, dried fruit, or nuts over the mixture.
Bake: Place in the oven and bake for 30-40 minutes until golden brown and set.