Preheat oven to 350°F. Cut Hawaiian sweet rolls in half horizontally, keeping the entire slab intact.
Melt 2 tablespoons of the butter in a 13x9-inch baking pan.
Coat both sides of the top half in the butter and place on a cutting board. Coat the bottom half in the remaining butter and leave inside the dish bottom side down. Sprinkle with 1 tablespoon of the Cinnadust.
In a small bowl, mix together brown sugar, cinnamon, and butter until fully combined.
Spread 3/4 of the cinnamon butter mixture evenly over the bottom half of the rolls.
Sprinkle the remaining Cinnadust on both sides of the top half of the rolls. Place on top of the filling. Spread the remaining cinnamon butter over the top.
Bake uncovered 20 minutes, or until warmed through and lightly golden. Remove from the oven and let sit for 5-10 minutes before icing.
In a bowl, beat cream cheese, heavy whipping cream, vanilla, and powdered sugar until smooth and creamy.
Spread the icing over the warm rolls. Serve immediately.