Instructions:

1. Preheat oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease it.

2. Prepare the cheese filling:

   • In a bowl, combine shredded cheddar, mozzarella, ricotta (if using), and sour cream.

   • Season with salt, pepper, and any herbs you like for added flavor.

3. Prepare the puff pastry:

   • Roll out the first sheet of puff pastry on a lightly floured surface. Place it onto the prepared baking sheet.

   • Spread the cheese mixture evenly over the pastry, leaving about 1 inch along the edges.

4. Top with the second sheet:

   • Place the second sheet of puff pastry on top of the cheese filling. Gently press the edges together to seal the pastry, folding them inward to form a crust around the cake.

5. Add the egg wash:

   • Beat the egg and brush it over the top of the pastry for a golden, shiny finish.

6. Bake:

   • Bake in the preheated oven for 30-35 minutes or until the pastry is golden brown and puffed up.

7. Serve:

   • Let the pastry cool for a few minutes before slicing and serving. Enjoy warm with a side salad or as a savory snack.