Prepare dressing: In a large bowl, whisk together mayonnaise, sour cream, sugar, apple cider vinegar, salt, and pepper.
Prepare salad: Add the peas, hard boiled eggs, bacon, and cheddar cheese to the large bowl with the dressing. Gently fold to combine. To keep them crisp, hold off on folding in the fried onion pieces just before serving.
Serve: As garnish, top with reserved peas, some additional crumbled bacon, more fried onion pieces, or chopped chives or scallions just before serving. Enjoy!