Flatten sandwich bread with a rolling pin and thinly spread Nutella on top. Mash raspberries. Add mashed raspberries to sandwich bread.
Mix eggs and buttermilk. Roll up sandwich bread, then roll them in the egg-buttermilk mixture.
Combine sugar and cinnamon. Fry sandwich bread on all sides in butter until golden, briefly pat dry on paper towels, then quickly roll in sugar-cinnamon-mixture.
Serve with berries, honey and/or yogurt. For a better look, you can also halve the rolls.