Preheat the oven to 350℉.
In a bowl, add the drained peaches, cornstarch, sugar, and cinnamon. Mix everything together then add them into the baking dish.
Slice the grand cinnamon rolls into about 1/2 inch thick. See photo, then lay them out across the top of the peaches.
Place in the oven and bake for 40-45 minutes or until the cinnamon rolls have baked up and are golden. Remove from oven and pour the melted butter across the cinnamon rolls, doesn't have to be perfect.
Next, spread the icing across the cinnamon rolls. Allow the dessert to cool a little because the peaches will be extremely hot, then serve and enjoy.