In a large mixing bowl, combine the thawed corn, cherry tomatoes, cucumber, and red onion. Stir until well mixed.
In a separate bowl, whisk together the mayonnaise, sour cream, apple cider vinegar, garlic powder, onion powder, salt, and black pepper until smooth.
Pour the dressing over the corn mixture and stir until everything is evenly coated.
If using, gently fold in the crumbled bacon and shredded cheddar cheese.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a good stir and garnish with chopped cilantro or parsley.