I just made this for Christmas morning and it tasted INCREDIBLE. And I'm not even a breakfast person. If you have any sort of special occasion coming up (or even if you don't), you really should make this. It feeds a bunch of people (maybe 5-10) so keep that in mind.

Ingredients

1 loaf sourdough bread
8 eggs
2 cups milk
1/2 cup heavy cream
3/4 cup sugar
2 tablespoons of vanilla

Topping:
1/2 cup flour
1/2 cup brown sugar
1 teaspoon cinnamon
1/4 teaspoon salt
1/2 cup cold butter, cut into pieces

Instructions

NOTE: There are two separate things that need to be refrigerated overnight.

Cut up the loaf into cubes and place evenly in a greased 9x13 pan (or something similarly sized).
In a bowl, mix together the eggs, milk, heavy cream, sugar and vanilla. Pour evenly over bread.
Cover your pan with Saran Wrap and refrigerate overnight.
Mix together the flour, brown sugar, cinnamon, and salt in a medium bowl.
Cut in butter with this mixture until crumbly and place in a Ziploc bag and refrigerate overnight as well.
In the morning, take the pan and Ziploc bag out of the fridge when ready to bake. Sprinkle crumbly mixture evenly over the bread.
Bake at 350 for 45 minutes to 1 hour depending on how soft you like it.

Original recipe from Lil Luna.