Preheat oven to 350°. Spray a 2-quart baking dish with cooking spray.
Prepare potatoes according to package directions. Add sour cream and green onion; using a potato masher, mash to desired consistency. Spread potato mixture in prepared pan. Top with pork; drizzle with barbecue sauce. Sprinkle with cheese.
Bake until heated through, about 20 minutes. Garnish with jalapeño, if desired.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/barbecue-stuffed-potato-casserole-recipe/