PREHEAT oven to 375°F. Mix meat, barbecue sauce, bread crumbs and egg. Shape into loaf in 12x8-inch baking dish.
BAKE 55 minutes. Meanwhile, bring water to boil in medium saucepan. Add milk, butter and salt; stir in potato flakes. Add cream cheese; stir until completely melted.
SPREAD potato mixture over meatloaf; top with Singles. Bake an additional 5 minutes or until Singles begin to melt.