In a large mixing bowl, whisk together the eggs, milk, sugar, vanilla extract, and cinnamon until fully combined and slightly frothy, about 2 minutes.

Carefully cut each Hawaiian roll in half, creating a top and bottom for soaking. Dip each half into the custard mixture for 10-15 seconds per side.

Place a skillet over medium heat and add 1-2 tablespoons of unsalted butter, letting it melt completely.

Arrange the soaked rolls cut-side down in the skillet and cook for about 3-4 minutes until golden brown, then flip and cook for another 3-4 minutes.

Transfer cooked rolls to a serving plate and top with maple syrup, fresh berries, or whipped cream.