Preheat oven to 375°F (190°C).
In a microwave-safe bowl, combine 4 tablespoons of melted butter with 1 tablespoon of brown sugar and ½ teaspoon of cinnamon. Microwave the mixture for about 30 seconds or until everything is melted and nicely mixed together.
4 tablespoons melted butter, 2 teaspoons cinnamon, 3 tablespoons brown sugar
Spray a 9x13-inch baking dish with non-stick spray. Arrange the 12 Hawaiian rolls in the dish. Carefully cut out the middle of each roll without cutting all the way to the bottom. Brush the tops and insides of the rolls with the melted cinnamon butter mixture.
12 count Hawaiian rolls
Dice the 4 apples into small chunks. Place the diced apples in a pot with the remaining 2 tablespoons of brown sugar, 1½ teaspoons of cinnamon, and 2 tablespoons of caramel sauce. Cook over medium heat for 10-15 minutes, stirring occasionally, until the apples are soft and the sauce has thickened into a rich, sweet filling.
4 apples
Spoon the apple filling into the centers of the prepared rolls, making sure each roll is generously filled.
Place the dish in the preheated oven and bake for 15 minutes or until the rolls are golden brown. Keep an eye on them to avoid burning. Once done, remove the rolls from the oven and let them cool slightly.
Pour some extra caramel sauce into a Ziploc bag, snip off a small corner, and drizzle the sauce over the rolls to add a sweet, sticky finish. Serve and enjoy!
2 tablespoons caramel sauce