Barbecue Pulled Pork Shepherd's Pie

Preheat the oven to 400 °F. For the ranch mashed potatoes: Peel the potatoes and cut them into 1-inch pieces, then place them in a large saucepan and cover with water. Bring the water to boil and cook until the potatoes are tender when pierced with a fork, about 10 minutes. Drain, and place in a large bowl. Add the ranch seasoning and sour cream and mash the potatoes until the mixture is thoroughly combined and most of the lumps are gone. Set aside. For the rest of the dish: Toss pulled pork with barbecue sauce (as much or as little as you'd like to use). Add it to a large casserole dish, smoothing it to create one even layer. Top with corn, then add a layer of mashed potatoes. Cover with shredded cheese and scallions. Bake in the oven for about 14-16 minutes, or until the cheese has melted.