Arrange bread slices in an even layer on the bottom of your baking dish.
Whisk together eggs, milk, half and half, vanilla and salt.
Stir in brown sugar and pour over bread.
Cover tightly and refrigerate overnight.
Preheat oven to 350 degrees.
Place butter slices on the top of the casserole.
Bake 40 to 45 minutes until golden brown.
As with any of my recipes, calorie counts and nutritional information varies greatly depending on which products you choose to use when cooking this dish.