Slice each Hawaiian roll in half and set aside.
In a large mixing bowl, whisk together the eggs, milk, vanilla extract, cinnamon, and sugar until well combined.
Preheat a large skillet or griddle over medium heat and add 1 tablespoon of butter, allowing it to melt and coat the surface.
Dip each half of the Hawaiian roll into the egg mixture, ensuring both sides are well coated but not soaked.
Place the coated rolls in the skillet, cut side down, and cook for about 2-3 minutes until golden brown. Flip and cook for an additional 2-3 minutes on the other side.
Repeat the process with the remaining rolls, adding more butter to the skillet as needed.
Serve warm with maple syrup drizzled on top and a dusting of powdered sugar if desired.