In a food processor, combine the green olives, feta cheese, cream cheese, sour cream, lemon juice, minced garlic, black pepper, and red pepper flakes (if using).
Pulse the mixture until smooth and well combined, scraping down the sides as needed.
Taste and adjust seasoning if necessary, adding more lemon juice or pepper to your liking.
Transfer the dip to a serving bowl and sprinkle with fresh parsley for garnish.
Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve with pita chips, crackers, or fresh vegetables.
Notes
For a creamier texture, add an extra tablespoon of sour cream.
Try adding chopped sun-dried tomatoes or roasted red peppers for an extra flavor twist.