Thaw 12 frozen dinner rolls. Place the rolls on a parchment-lined baking sheet, cover them, and let them thaw at room temperature until they can be rolled out.
Once rolls are thawed and ready to use, preheat the oven to 350 degrees Fahrenheit and spray a 9x5-inch loaf pan with non-stick spray. Flatten the rolls to about ¼ inch thick.
In a bowl, mix ¼ cup unsalted butter,½ cup granulated sugar, and 1 tablespoon ground cinnamon. Coat each roll in the butter mixture and place them in a stack on top of each other.
Once all the rolls have been coated, take the stack and place it sideways in the loaf pan, fitting them to fill the pan.
Brush any remaining butter mixture over the top of the loaf once the pan has been filled. Cover and let the loaf rise for about an hour until it’s risen almost to the top of the pan.
When the loaf has risen, bake it for 30-35 minutes. The dough should be browned where it’s exposed, and the loaf should temp out to 190 degrees Fahrenheit. Remove the loaf from the oven and let it cool completely before glazing.
While the loaf cools, make the glaze. In a bowl, mix together 1 cup powdered sugar, 1-2 tablespoons whole milk, and ½ teaspoon vanilla. Start with 2 tablespoons of milk and add more as needed to achieve the desired consistency. When the loaf is cooled, drizzle the glaze over the top and serve!