In a bowl, prepare the custard for dipping by combining eggnog, eggs, brown sugar, vanilla extract, nutmeg, and cinnamon. Whisk until smooth and well mixed.
Heat a large pan over medium-low to medium heat. Add a bit of butter. Ensure the pan isn't too hot to prevent burning.
Quickly dip each Hawaiian Roll into the custard and place it on the pan. Repeat with a few more rolls until the pan is filled but not overcrowded.
Cook for about 2 minutes on each side until golden brown and crispy. Remove from the pan and repeat with the remaining rolls.
Sprinkle powdered sugar over the rolls and drizzle with maple syrup. For an extra touch, serve with berries and whipped cream!