Preheat oven to 350°F (175°C). In a medium bowl, combine graham cracker crumbs and melted butter until mixture resembles wet sand. Press firmly into the bottom of a greased 9x13 inch pan.
Bake crust for 10 minutes, then remove from oven and let cool slightly.
In a large bowl, beat softened cream cheese until smooth. Add sugar and beat until combined.
Add eggs one at a time, mixing well after each addition. Stir in lemon juice, lemon zest, and flour until fully incorporated.
Pour cheesecake filling over the cooled crust and smooth the top.
Bake for 25-30 minutes until the edges are set but the center is slightly jiggly.
Cool completely at room temperature, then refrigerate for at least 2 hours before slicing and serving.
Notes
For extra zest, garnish with fresh lemon slices or a dusting of powdered sugar before serving.