Grease baking dish with butter thoroughly.
Arrange bread slices in single layer.
Whisk eggs in large bowl completely.
Add cream, milk, sugar, vanilla, salt.
Pour custard mixture over bread evenly.
Cover dish with foil tightly.
Refrigerate overnight for best results.
Preheat oven to 350°F next morning.
Bake covered for 30 minutes first.
Remove foil and bake 15 minutes.
Sprinkle brown sugar on top evenly.
Use torch to caramelize sugar completely.