Preheat your oven to 350°F (175°C). Grease an 8x8 inch baking dish.
Spread the cubed bread and diced apples evenly in the dish.
In a bowl, whisk together milk, eggs, sugar, cinnamon, melted butter, vanilla, and salt.
Pour the mixture over the bread and apples, pressing gently so everything absorbs the custard.
Drizzle caramel sauce over the top.
Bake for 35–40 minutes, until golden and set.
Serve warm, maybe with a scoop of vanilla ice cream for good measure!