Preheat oven to 350 degrees F.Wash potatoes and cut into chunks. Place potatoes into a large pot of boiling water and cook until fork tender, about 15 minutes.Drain the potatoes and place into a large mixing bowl. Add all the rest of the ingredients, leaving out 1 cup of the cheese and stir until well combined.Lightly butter a 9 x 13 casserole dish or square Dutch oven. Place the potato mixture in baking dish. Top with remaining 1 cup of cheese.Bake for 30 minutes until cheese is melted.