Cut bread into 1/2" cubes.
Coat muffin pan with butter.
Divide bread between all 12 muffin cups.
Whisk together the milk, eggs, sugar, vanilla, and cinnamon until blended.
Slowly add about 1 1/2 oz of liquid over bread in each cup. I use a baster to make this easy.
Cover and refrigerate for several hours.
Preheat oven to 350.
Combine butter, brown sugar, flour and cinnamon.
Mix until you have a well blended crumbs.
Cover the muffins evenly with this topping.
Bake for 25 minutes or until tops are golden brown.
Let cool for 10 minutes.