Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the ricotta cheese, cream cheese, and sugar. Mix until smooth.
Add the eggs one at a time, beating well after each addition.
Stir in the vanilla extract and cornstarch until well combined.
Finally, fold in the heavy cream.
Pour the mixture into a greased 9-inch springform pan.
Bake in the preheated oven for about 60 minutes, or until the center is set and the top is lightly golden.
Let the cheesecake cool in the pan, then refrigerate for at least 4 hours before serving.