Make the dressing. In a small bowl, stir together the mayonnaise, sugar, and salt until well combined.
Layer the salad. In a large trifle bowl or deep serving bowl, begin layering the ingredients. For the layered version, start with peas, followed by cheddar cheese, mayonnaise dressing, diced onion, hard-boiled egg, another layer of peas, shredded lettuce, tomatoes, bacon, cheese, peas, and lettuce.
Add the toppings. Finish the salad with mayonnaise dressing, diced eggs, croutons, and a little of the remaining ingredients sprinkled over the top.
Chill. Cover and refrigerate for at least 1 hour before serving so the salad is cold and the flavors have a chance to come together.
Serve. Serve chilled, scooping down through the layers so each serving gets a little of everything.