2/3 cup low-fat sour cream  | 
                                                1/3 cup light mayonnaise  | 
                                                2 tablespoons chopped fresh parsley  | 
                                                2 tablespoons sweet pickle relish  | 
                                                1 tablespoon spicy brown mustard  | 
                                                1/4 teaspoon white pepper  | 
                                                4 cups cooked elbow macaroni (about 8 ounces uncooked pasta)  | 
                                                1 cup sliced green onions  | 
                                                1 cup frozen green peas, thawed  | 
                                                3/4 cup (3 ounces) diced reduced-fat sharp cheddar cheese  | 
                                                1/2 cup diced carrot  | 
                                                1/2 cup diced green bell pepper  | 
                                                1/2 cup sliced celery  | 
                                                1/2 cup diced lean ham (about 2 ounces)  |