Preheat oven to 250C or 480F
Slightly warm blueberries in the microwave or in a pan over medium heat until slightly soft or broken down. This step can be skipped and whole blueberries can be added to batter.
Whisk cream cheese with a spoon until broken down
Add sweetener, cornstarch and vanilla and mix until well incorporated
Add yogurt and egg and mix until just combined and incorporated
Stir through the blueberries and a to add cheesecake into a lined mini ramekin (10x6cm)
Bake for 12-15 minutes on the top rack
Allow to cool before refrigerating for 1-3 hours (for best results) or freezing for 30 minutes (if you are impatient)
Serve with a dusting of icing sugar or warmed blueberries