Can I make seven layer salad the day before?
Yes—assemble the salad layers (lettuce through onion) up to 24 hours ahead, then add the dressing, eggs, bacon, and cheese just before serving to prevent sogginess.
Why does my seven layer salad get watery?
Dressing applied too early draws moisture from vegetables. Keep dressing separate until 30 minutes before serving, or add it only to the bottom lettuce layer and serve the rest on the side.
Can I use a different lettuce instead of romaine?
Yes—iceberg or butter lettuce work, though romaine holds up better to the weight of upper layers and dressing without wilting.
What can I substitute for mayonnaise in the dressing?
Greek yogurt (1:1 swap) or sour cream (1:1) lighten the dressing; blend with a touch of milk if too thick.
How far in advance can I hard-boil the eggs?
Hard-boil eggs up to 5 days ahead; store peeled or unpeeled in an airtight container in the refrigerator.