Cook bacon in large skillet over medium-high heat until crisp, 8-10 minutes. Remove bacon and drain on paper towels, reserving 2 tablespoons drippings. Crumble bacon and set aside.
Stir together reserved bacon drippings, potatoes, next 5 ingredients, and 2 cups cheddar cheese in a large microwave safe bowl. MIcrowave on HIGH 4 minutes. Stir in sour cream and chiles until well blended.
Spoon potato mixture into a lightly greased 13X9" baking dish. Sprinkle evenly with bacon and remaining 1 cup cheddar cheese. Arrange pork evenly over cheese. Drizzle barbecue sauce evenly over pork.
Bake at 350 degrees for 45 minutes., Let stand 10 minutes before serving. Garnish with chopped parsley.