Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the graham cracker crumbs, melted butter, and sugar. Stir until the mixture resembles wet sand.
Press the mixture evenly into the bottom of a 9x13-inch baking dish. Bake for 8-10 minutes or until lightly golden.
Make the Filling:
In a large bowl, beat the softened cream cheese until smooth. Add the pumpkin puree, sugar, eggs, vanilla extract, and spices. Mix until everything is well combined and creamy.
Assemble and Bake:
Pour the pumpkin filling over the baked crust, smoothing it out to ensure an even layer.
Bake for 35-40 minutes or until the filling is set and slightly jiggly in the center.
Cool and Serve:
Allow the bars to cool at room temperature for about one hour, then chill in the refrigerator for at least 4 hours before cutting into squares. Serve chilled, topped with your favorite toppings!