Preheat oven to 350°F and position a rack in the middle of the oven.
Chop your Sola bread into 1" squares. Reserving some for heart garnishes if desired. Place squares of sola into a baking casserole dish.
In a separate bowl, whisk together eggs, milk, vanilla extract, cinnamon and Sola sugar until well combined.
Pour wet mixture over the Sola Bread in the casserole dish and evenly coat all pieces.
Place heart-shaped Sola bread pieces on top to garnish. Sprinkle top thoroughly with Sola sugar.
Sprinkle in hazelnuts and add Nutella in small spoonfuls around the bread.
Place in oven and bake for 35 minutes.
Remove from oven, let cool and then decorate with additional white chocolate hearts if desired.