Preheat the oven to **200°C (390°F)** and line a small baking dish with parchment paper.
Add cream cheese, Greek yogurt, egg, vanilla extract, sweetener, and protein powder to a blender. Blend until smooth.
Pour the mixture into the lined baking dish. Add some blueberries and gently swirl them through the batter.
Bake for 25 minutes until the cheesecake is set.
Let the cheesecake cool, then place it in the refrigerator for 1 hour to firm up.
In a small pan over medium heat, cook blueberries with the cornflour mixture until thick and jam-like.
Spread the blueberry topping over the cheesecake.
Sprinkle crushed biscuit around the edges and drizzle melted white chocolate if desired.
Chill for another 30 minutes , slice into six pieces, and serve.