Preheat the oven to 350°F (175°C). Grease a 9x9-inch baking pan and line it with parchment paper, making sure to leave some overhang for easy removal later.
In a medium bowl, mix the gingerbread cookie crumbs with melted butter until well combined. Press the mixture evenly into the bottom of the prepared pan to create the crust.
In a large mixing bowl, beat the softened cream cheese until smooth and creamy, about 2 minutes. Add the granulated sugar and continue mixing until well incorporated.
Add the eggs one at a time, mixing well after each addition. Then mix in the vanilla extract, ground ginger, ground cinnamon, ground nutmeg, and a pinch of salt until fully blended.
Stir in the sour cream and molasses until the mixture is completely smooth.
Pour the cheesecake mixture over the prepared gingerbread crust, spreading it evenly with a spatula.
Bake in the preheated oven for 40-45 minutes, or until the edges are set and the center is slightly jiggly (it will firm up as it cools).
Turn off the oven and allow the cheesecake to cool inside for about an hour for gradual temperature transition, then transfer to the refrigerator and chill for at least 4 hours or overnight.
Once chilled, lift the cheesecake out of the pan using the parchment overhang, and slice it into bars.
Optionally, dust the tops with powdered sugar or serve with a drizzle of caramel sauce before serving.
Notes
Arrange the bars on a festive serving platter, garnished with a sprinkle of ground cinnamon and a sprig of fresh mint for a pop of color.