Grease a 9x13 baking dish. Place cubed bread in dish.
Whisk together eggs, buttermilk, milk, ½ cup brown sugar, 1 teaspoon cinnamon, nutmeg and vanilla extract. Pour mixture over bread. Press down slightly to make sure all of the bread is covered.
Cover and refrigerate overnight.
Preheat oven to 350 degrees. Mix together ¼ cup brown sugar, ¼ cup granulated sugar and 1 Tablespoon of cinnamon. Sprinkle evenly over french toast.
Bake for 45-50 minutes.
Serve with maple syrup and butter.
Recipe by Crumbs and Chaos at http://www.crumbsandchaos.dreamhosters.com/2015/03/cinnamon-crunch-buttermilk-french-toast/