Preheat your oven to 375°F (190°C) and lightly grease the baking dish with melted butter.
Slice the apples thinly and place them in a bowl. Toss with a sprinkle of cinnamon and brown sugar to coat evenly.
Arrange the sliced apples evenly in the bottom of the prepared baking dish, creating a colorful, layered base.
Open the cinnamon rolls and cut each into bite-sized pieces. Spread these pieces over the apples in an even layer.
Drizzle melted butter over the cinnamon roll pieces to add richness during baking. Cover the dish with foil.
Bake in the preheated oven for about 25-30 minutes, or until the cinnamon rolls are puffed and golden brown with bubbling edges.
Remove the casserole from the oven and let it cool slightly. If desired, drizzle the icing from the cinnamon rolls on top for extra sweetness.
Serve warm, allowing the gooey cinnamon rolls and tender apples to shine through. Enjoy the aromatic, comforting layers of this baked breakfast treat.