Brush an 8-inch iron skillet with the melted butter. Arrange the pieces of bread in a circle in the skillet. In a large bowl mix the eggs, milk, 1 teaspoon of cinnamon, ¼ cup of sugar, vanilla extract and salt.
Pour the egg mixture over the bread in the skillet. Set aside for 10 minutes to allow the bread to soak up the egg mixture. Mix the Nutella with ½ teaspoon of cinnamon and warm in the microwave.
Drizzle the warmed Nutella over the top of the bread in the skillet.
Sprinkle sugar over the top of the bread. Bake in a preheated 350°F. oven for 45 to 60 minutes or until the egg mixture has set in the center of the pan.