In a large mixing bowl, whisk together the eggs, milk, vanilla extract, cinnamon, salt, and nutmeg until smooth.
Heat a large nonstick skillet or griddle over medium heat. Melt one tablespoon of butter until it begins to foam.
Dip each sliced Hawaiian roll into the custard mixture, coating both sides without soaking for too long.
Arrange the coated rolls on the hot skillet.
Cook for 2 to 3 minutes until the bottoms become golden brown.
Flip each roll carefully and cook another 2 to 3 minutes until both sides are evenly browned and the centers are cooked through.
Add the remaining butter as needed while cooking the remaining batches.
Serve this Hawaiian Roll French Toast Recipe warm with powdered sugar, maple syrup, fresh berries, whipped cream, or your favorite breakfast toppings.