1 1/2 cups milk
1 egg white
1/2 teaspoon ground cinnamon
1/2 teaspoon vanilla extract
Preheat oven to 400 degrees F (200 degrees C).
In a large bowl, whisk together milk, egg white, cinnamon and vanilla. Pour hot milk mixture into a 9x15 inch baking dish.
Bake at 400 degrees F (200 degrees C) until toothpick inserted in center comes out clean. Cool to room temperature. Cut into squares as desired.