In a large bowl mix the cream cheese until smooth. Add sugar, salt, cornstarch and mix until combined.
Add the egg and mix until it is well incorporated. Add vanilla extract, lemon zest and sour cream. Mix until well combined. Try to not overmix the batter to incorporate as little air as possible.
Pour the cream cheese mixture over the prepared crust.
Gently spoon the blueberry sauce on top.
Use a skewer to create swirls on top.
Bake at 300°F (150°C) for 25-30 minutes.
Remove and run a sharp knife around the inside edge of the pan. Let it cool completely at room temperature. Cover and refrigerate overnight.
Transfer the cheesecake to a serving platter and cut into squares.