Overnight French Toast

1 cup dark brown sugar
1/2 cup butter
2 tablespoons corn syrup
12 Slices of thick sliced white bread
1 1/2 cup milk
6 Large eggs
1 teaspoon vanilla
1/4 teaspoon salt

Combine corn syrup, butter and brown sugar in a saucepan and simmer gently until the sugar melts. Pour this mixture into the bottom of a greased 9×12 inch casserole dish. Place the bread slices over the sugar mixture. In a separate bowl beat together eggs, milk, vanilla and salt. Pour egg mixture over bread. Cover the dish and let stand overnight in refrigerator. The following morning, preheat over to 350F. Uncover the casserole dish and bake for approximately 45 minutes.