In a medium bowl, whisk together the eggs, whole milk, vanilla extract, ground cinnamon, nutmeg, and 1 tablespoon of sugar until well combined. Set aside.
In another bowl, mix the softened cream cheese and chocolate hazelnut spread until smooth and thoroughly blended.
Take a slice of thick bread and spread a generous layer of the cream cheese mixture on one side. Top with another slice of bread to create a sandwich. Repeat for the remaining slices.
Heat a non-stick skillet or griddle over medium heat and add a pat of butter to coat the surface.
Dip each stuffed sandwich into the egg mixture, allowing it to soak for a few seconds on each side to absorb the custard.
Once coated, place the sandwiches in the skillet. Cook for about 3-4 minutes per side or until they are golden brown and crisp.
While cooking the French toast, mix the 1/2 cup of sugar and 1 tablespoon of cinnamon in a shallow dish.
Once cooked, immediately sprinkle the hot French toast sandwiches in the cinnamon sugar mixture to coat them generously.
Remove the French toast from the skillet and place them on a serving platter. Serve warm with a drizzle of maple syrup on top.