In a mixing bowl, combine graham cracker crumbs, melted butter, and granulated sugar. Stir until the mixture resembles wet sand.
Press the graham cracker mixture firmly into the bottom of a lined 9x9-inch baking dish to create an even layer. Chill in the refrigerator for 15 minutes.
In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy. Gradually add powdered sugar, mixing until well combined.
Pour in the fresh lemon juice, lemon zest, and vanilla extract; mix until fully incorporated and smooth.
In a separate bowl, whip the heavy cream until it forms stiff peaks. Carefully fold the whipped cream into the lemon cheesecake mixture until just combined.
Pour the cheesecake filling over the chilled crust and spread it evenly using a spatula. Smooth the top.
Cover the dish with plastic wrap and refrigerate for at least 4 hours or until set, preferably overnight for the best texture.
Once set, lift the cheesecake bars out of the dish using the parchment paper. Cut into squares or rectangles, and serve chilled.
Notes
Dust the top with powdered sugar and garnish with lemon slices and mint leaves for presentation.