Heat-treat the dry cake mix in a microwave-safe bowl for 60 seconds, stirring every 15 seconds until it reaches 160°F (71°C) to ensure safety for raw consumption.

In a mixing bowl, combine the Greek yogurt and vanilla extract, whisking until smooth.

Slowly fold in the protein powder and the heat-treated cake mix until no dry clumps remain.

Fold in half of the rainbow sprinkles gently into the mixture.

Transfer the dip to a serving bowl and garnish with the remaining sprinkles.

Serve immediately with apple slices or graham crackers, or refrigerate for 30 minutes to allow the texture to firm.