Grease a 9x13 inch baking dish with butter.
Slice the bread into thick pieces.
Arrange slices in the baking dish, overlapping slightly.
In a bowl, whisk together eggs, milk, cream, sugar, vanilla, cinnamon, and salt.
Pour the egg mixture evenly over the bread slices.
Cover the dish with plastic wrap and refrigerate overnight.
Preheat your oven to 350°F (175°C) the next morning.
Bake uncovered for 40-45 minutes until golden brown.
Let it cool slightly before serving.
Serve with syrup, fresh berries, or whipped cream.