In a large mixing bowl, combine the thawed sweet peas, chopped hard-boiled eggs, crumbled bacon or chopped ham (if using), chopped green onions, and shredded cheddar cheese.

Sprinkle in the black pepper, salt, garlic powder, celery seeds (or chopped celery), and a dash of cayenne. Stir thoroughly to ensure the seasonings are evenly distributed.

In another bowl, whisk together the mayonnaise and sour cream until they form a smooth mixture. Pour this dressing over the pea mixture and gently stir to coat all the ingredients.

Cover the salad and refrigerate it for at least an hour before serving to allow the flavors to blend together wonderfully.