Preheat the oven to 350°F. Line an 8-inch square baking pan with foil then grease it with cooking spray.
In a medium bowl, stir together the crushed graham crackers and melted butter. Transfer the mixture into the prepared pan and press it firmly into an even layer.
In the bowl of a stand mixer fitted with the paddle attachment, beat together the cream cheese, sugar, lemon zest, lemon juice and vanilla extract until well combined. Add the eggs one at a time, beating between each addition, then pour the cheesecake mixture atop the crust, spreading it into an even layer.
Bake the cheesecake for 20 to 25 minutes until the center is almost set.
Remove the cheesecake from the oven and let them cool completely before covering the pan with plastic wrap and refrigerating the cheesecake for 3 hours.
Remove the cheesecake from the fridge, slice it into bars and serve.
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