Heat oil in medium saucepan on medium heat. Add garlic; cook and stir 1 min. Stir in tomatoes and broth; bring to boil.
Blend, in batches if necessary, in blender until smooth. Return to pan. Whisk Neufchatel, tomato paste, milk and seasoning until blended. Add to tomato mixture; mix well. Cook on medium-low heat 10 min. or until heated through, stirring frequently.
Meanwhile, fill bread slices with Singles to make 2 sandwiches. Spread outsides of sandwiches with butter; sprinkle both sides of each sandwich with Parmesan. Cook in skillet on medium heat 3 min. on each side or until Singles are melted and sandwiches are golden brown on both sides.
Cut each sandwich into 16 squares. Serve over individual bowls of soup.