Prepare mashed potatoes according to box instructions. In a bowl, add prepared mashed potatoes and parmesan cheese and mix until combined; set aside. On a clean table, unbox crescent roll dough and spread flat. Take a 1/4-cup scoop of mashed potato filling (for each crescent), spread evenly, then roll into a crescent shape (roll wide end to small end). Place rolls at an even distance from each other on a parchment paper-lined baking sheet and bake at 350 degrees for approx. 12–14 minutes or until light golden brown or according to manufacturer’s instructions.