Preheat your oven to 350°F (175°C) and line an 8x8 inch baking pan with parchment paper, leaving some overhang for easy removal later.
In a medium bowl, combine the graham cracker crumbs, melted butter, and 1/4 cup sugar. Mix until well combined and crumbly.
Press the mixture firmly into the bottom of the prepared baking pan to create an even crust layer.
In a large mixing bowl, beat the softened cream cheese until smooth and creamy.
Add in the pumpkin puree, 3/4 cup sugar, eggs, vanilla extract, and spices (cinnamon, nutmeg, ginger, clove, and salt) to the cream cheese. Mix until well incorporated and no lumps remain.
Pour the pumpkin cheesecake mixture over the graham cracker crust in the baking pan. Spread it out evenly with a spatula.
Bake in the preheated oven for 30-35 minutes, or until the cheesecake is set around the edges and slightly jiggly in the center.
Allow the bars to cool completely at room temperature, then refrigerate for at least 4 hours or overnight to set.
Once chilled, lift the bars out of the pan using the parchment paper overhang and cut them into squares.
Optionally, top each square with a dollop of whipped cream before serving.
Notes
Serve the cheesecake bars on a decorative platter, and sprinkle a dash of cinnamon or nutmeg over the whipped cream for an extra festive touch.