01 - Combine Greek yogurt, whipped cream cheese, and vanilla protein powder in a medium mixing bowl. Mix thoroughly until completely smooth and creamy.
02 - Incorporate powdered sugar and vanilla extract into the mixture. Continue stirring until fully integrated and no lumps remain.
03 - If mixture is too thick, gradually add milk one tablespoon at a time, mixing after each addition, until desired dip consistency is achieved.
04 - Gently fold in rainbow sprinkles using a spatula, being careful not to overmix.
05 - Transfer dip to serving dish and sprinkle additional rainbow sprinkles on top for presentation.
06 - Serve immediately with graham crackers, animal crackers, fresh fruit, or pretzels for dipping.