Step 1

Prepare Dinner as directed on package. Meanwhile, melt 2 tsp. butter in large saucepan on medium heat. Add onions; cook and stir 5 min. Stir in broth, water and tomatoes. Bring to boil; simmer on medium-low heat 10 min. or until onions are tender.

Step 2

Blend tomato mixture, in small batches, in blender until smooth, returning each puréed batch to saucepan. Keep warm until ready to serve.

Step 3

Fill bread slices with Singles to make 2 sandwiches. Spread outsides of sandwiches with remaining butter. 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 12 pieces.

Step 4

Spoon Dinner into 6 bowls; top with basil, soup and grilled cheese "croutons."