Cook pasta according to directions, but without using salt or oil. Drain and rinse with cold water. Place in a large serving bowl. Add tomatoes, bacon and salad greens. In a small bowl, combine mayonnaise, sour cream, mustard, sugar, vinegar, salt and pepper; mix well. Spoon over pasta mixture and toss gently to coat.

Variation: Use only 3 cups of salad greens and add 1 cup raw broccoli flowerets