Preheat oven to 400°F.
In a large flat dish, combine the eggs, milk, sugar, cinnamon and vanilla. Let the bread soak in a single layer in the mixture for about two minutes. Turn it and let it soak until all the custard is absorbed.
In a large flat baking dish (9×13-inch), melt the butter. Add the bread in a single layer.
Bake for 15 minutes. Turn the bread over and bake 10 more minutes or until golden on both sides. Serve with a pat of Challenge Butter, maple syrup, powdered sugar, jam or fresh fruit.