A new intersting seven layer salad. Cooking time is refrigeration time.
Prepare macaroni and cheese as directed on box.
Combine mayo, onions and mustard; add to macaroni and cheese.
In a 9x12 baking dish, layer half of macaroni and cheese and all of the lettuce, tomatoes, peas, celery and eggs.
Cover with remaining macaroni and cheese; press to edges to seal.
Cover; refrigerate several hours or overnight.
Top with bacon just before serving.
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