Preheat oven to 400°. Cut rolls into 1-inch cubes. Place cubes on a baking sheet; coat with cooking spray. Bake 6 to 7 minutes or until toasted.
Combine light Caesar dressing, basil strips, and lemon juice in a large bowl. Add bread cubes, cannellini beans, diced tomato, and sliced onion, tossing to coat. Chill 1 hour. Toss with lettuce before serving.
Note: We tested with Girard's Light Caesar Dressing.