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