Whisk together the eggs, sugar, cornstarch and vanilla until smooth.
Add the sour cream and mix until fully combined.
Pour the mixture into a baking dish or cake pan.
Bake at 180°C (355°F) for about 1 hour, or until deeply golden and the centre is set.
Let it cool completely before slicing.
Serve chilled or at room temperature. It's delicious on its own or with fresh berries and a dusting of powdered sugar.
