1Empty Pasta mix into 3-quart saucepan 2/3 full of booiling water. Gently boil uncovered 12 minutes, stirring occasionally.
2Drain pasta. Rinse with cold water. Shake to drain well.
3Stir together Seasoning mix, mayonnaise, mustard, onions and celery in large bowl. Stir in pasta and eggs until evenly coated. Cover and refrigerate leftovers.