Top half of each tortilla with beans, cheese, bacon and scallions. Fold tortilla over filling; press down with back of pancake turner. Lightly brush melted butter on both sides of each filled tortilla.
Heat 12-inch nonstick skillet over medium heat. Cook 2 filled tortillas at a time 3 to 4 minutes, turning once, until golden brown and heated through. Cut into wedges. Serve with sour cream and salsa.