Prepare the Crust:

• Preheat your oven to 350°F (175°C).
• In a mixing bowl, combine the graham cracker crumbs, sugar, and melted butter until crumbly and well-mixed.
• Press the mixture into the bottom of a 9-inch (23 cm) springform pan, creating an even layer. Set aside.

Prepare the Cheesecake Filling:

• In a large mixing bowl, beat the twaróg (or cream cheese) until smooth and creamy using an electric mixer.
• Add the sugar and continue to beat until well incorporated.
• Add the eggs one at a time, mixing well after each addition.
• Stir in the vanilla extract, sour cream, and flour until smooth and uniform. Avoid overmixing, as this can affect the cake’s texture.

Pour the Filling:

• Pour the cheesecake mixture over the prepared crust in the springform pan. Smooth the top with a spatula to create an even surface.

Bake the Cheesecake:

• Place the cheesecake in the preheated oven and bake for 1 hour, or until the edges are set and the center is slightly jiggly but not liquid.

Cool the Cheesecake:

• Turn off the oven and leave the cheesecake in the oven with the door slightly ajar for 1 hour. This will prevent cracking by allowing the cheesecake to cool gradually.

Chill:

• Remove the cheesecake from the oven and transfer it to the refrigerator. Chill for 3 hours or until completely cooled and set.

Optional Toppings:

• Before serving, top with fresh berries, jam, or whipped cream for added flavor and presentation.

Serve:

• Slice and serve chilled. Enjoy the rich, creamy, and slightly tangy flavors of traditional Polish Sernik!