First, make sure everything is prepped and ready. Then, preheat the oven to 375℉.
Grab a large piece of plastic wrap then lay it out on the counter, the plastic must be larger than the dough. Carefully roll out the crescent roll dough sheet by hand and lay it out across the plastic wrap, flat. Spread the butter across the dough leaving 1/2" of space from the edges.
In a small bowl, mix together the brown sugar and cinnamon. Then sprinkle that mixture across the butter on top of the dough sheet. Grab the edge of plastic at one of the shorter ends and begin to roll the cinnamon rolls. Tightly as possible, but avoid tearing the dough. Once rolled, cut off 1/2" from each end revealing the cinnamon mixture.
Using a wet knife, slice through the dough to cut the cinnamon rolls. If the knife starts to stick to the dough, rub some more water across it. Aim for 1.5 to 2" slices. Once all the slices are made, grab your baking dish.
Arrange the cinnamon rolls in a way that they are all touching in a baking dish. Place the dish in the oven and bake for 20-25 minutes or until the tops are golden. While they are baking, whip together the icing.
Remove the crescent roll cinnamon rolls from the oven and spread the frosting across the top while they are still hot. Allow them to cool then serve and enjoy!