Whisk together the sour cream, mayonnaise, apple cider vinegar, salt, and pepper in a large bowl until well combined.
Add the thawed peas, finely chopped red onion, sharp cheddar cheese cubes, and crispy cooked chicken to the bowl.
Stir gently to combine all the ingredients, ensuring the peas are well coated with the creamy dressing.
Season with additional salt and pepper to taste if needed.
Serve immediately or refrigerate for later. Enjoy!