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 protein powder lumps remain.
02 - Add powdered sugar and vanilla extract to the mixture. Stir vigorously until fully incorporated and the texture is uniform throughout.
03 - Check the dip's thickness. If too dense, gradually add milk one tablespoon at a time, mixing between additions, until you achieve a smooth, dip-able consistency.
04 - Gently fold in rainbow sprinkles using a spatula, being careful not to overmix and break them apart.
05 - Transfer the dip to an attractive serving bowl. Sprinkle additional rainbow sprinkles over the top for visual appeal.
06 - Serve immediately alongside graham crackers, animal crackers, fresh fruit slices, or pretzels for dipping.