Preheat your oven according to popcorn chicken package directions.
Peel and dice your potatoes. Add to a pot of boiling water and cook until fork tender, about 15-20 minutes.
While the mashed potatoes are cooking, cook your popcorn chicken according to package directions.
While your potatoes are boiling and your popcorn chicken is baking, work on your gravy. In a saucepan, combine your brown gravy mix with one can of cream of chicken soup and then fill up half of that can with water and add it to the saucepan. Wisk together on low heat until heated through.
Once your potatoes are fork tender, drain the water and mash. Add butter, sour cream, and milk until desired consistency. Add salt and black pepper to taste.
Assemble ingredients in a 9x13 baking pan in this order- mashed potatoes, popcorn chicken, corn, brown gravy, and shredded cheese.
Bake in the oven at 350 for 15-20 minutes until heated through. Broil on high a couple minutes to get the cheese melted and gooey. Enjoy!