2 tablespoons nonfat plain yogurt
2 tablespoons light mayonnaise
1/3 cup chopped celery
2 tablespoons finely chopped onions
1 (9.75 ounce) can Swanson?(r) Premium Chunk Chicken Breast in Water, drained
8 slices Pepperidge Farm?(r) Whole Grain 100% Whole Wheat Bread
8 slices tomatoes
4 lettuce leaves