01 - Preheat oven to 325°F. Line an 8x8-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, combine graham cracker crumbs, sugar, and melted butter. Mix until evenly moistened and press firmly into the bottom of the prepared pan.
03 - Bake crust for 8-10 minutes until lightly golden. Remove from oven and let cool while preparing the filling.
04 - In a large bowl, beat cream cheese and sugar until smooth and creamy. Add eggs one at a time, mixing thoroughly after each addition. Stir in sour cream and vanilla extract until fully incorporated.
05 - Gently fold diced strawberries into the cheesecake batter. Pour mixture over the cooled crust and smooth the top with a spatula.
06 - Bake for 30-35 minutes until the center is just set and edges are lightly golden. The center should still have a slight jiggle.
07 - Let bars cool to room temperature, then refrigerate for at least 3 hours or until completely chilled and firm.
08 - Melt chocolate chips and butter together in a heatproof bowl over simmering water, or microwave in 20-second intervals, stirring until smooth and glossy.
09 - Pour melted chocolate evenly over the chilled cheesecake layer. Top with halved strawberries if desired. Refrigerate for 30 minutes until chocolate is set.
10 - Lift bars from pan using parchment overhang. Cut into 12 squares with a sharp knife warmed under hot water for clean slices.