01 - Preheat oven to 325°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
02 - Combine graham cracker crumbs, granulated sugar, and melted butter in a mixing bowl. Press mixture firmly and evenly into the base of the prepared pan to form the crust.
03 - In a large mixing bowl, beat softened cream cheese and sugar with an electric mixer until smooth and creamy. Add eggs, one at a time, mixing well after each addition. Blend in vanilla extract and sour cream until the filling is fully combined.
04 - Pour the cheesecake batter over the crust and spread evenly. Bake for 40 to 45 minutes or until the center is just set and edges are lightly golden. Allow to cool at room temperature.
05 - Refrigerate the cheesecake for at least 3 hours until fully chilled. Once set, top evenly with chopped strawberries and blueberries. Drizzle melted white chocolate over the fruit if desired.
06 - Remove the cheesecake slab using the parchment overhang. Slice into bars and serve chilled.