Begin by preheating your oven to 350°F (175°C). Prepare a 9x9-inch baking pan by lining it with parchment paper, ensuring there's an overhang on the sides for easy lifting once the cheesecake bars are set.
In a medium bowl, combine the graham cracker crumbs with the melted butter. Mix thoroughly until the texture resembles damp sand.
Firmly press the crumb mixture into the bottom of the lined baking pan, ensuring it forms an even and compact layer. Bake in the preheated oven for 8-10 minutes, or until the crust is lightly golden. Once baked, remove the crust from the oven and allow it to cool completely.
In a large mixing bowl, use a hand mixer or stand mixer to beat the softened cream cheese until it's smooth and creamy. This step is crucial to ensure there are no lumps in your filling.
Add the pumpkin puree, granulated sugar, eggs, vanilla extract, pumpkin pie spice, cinnamon, and salt to the bowl with the cream cheese. Beat on low speed until all ingredients are well combined and the mixture appears creamy.
Carefully pour the pumpkin cheesecake filling over the cooled graham cracker crust, using a spatula to spread it evenly across the surface.
Return the pan to the oven and bake for 25-30 minutes, watching closely for the edges to be set while the center remains slightly jiggly. This will help achieve a creamy texture.
Upon baking, remove the cheesecake bars from the oven and let them cool in the pan for approximately 1 hour at room temperature. After that, transfer to the refrigerator and chill for at least 2 hours or overnight, which enhances the flavor and texture.
Once chilled, use the parchment paper overhang to lift the entire block of cheesecake out of the pan. Carefully cut into squares or bars using a sharp knife.
Serve these delicious bars chilled, optionally garnishing each piece with a generous dollop of whipped cream for an extra touch of indulgence.