In a medium mixing bowl, combine the gingersnap cookie crumbs with the melted unsalted butter. Stir well until the crumbs are fully coated and the mixture resembles wet sand.
Take about 2 tablespoons of the crumb mixture and evenly spoon it into the bottom of each serving cup or glass. Press it down firmly with the back of a spoon or your fingers to create a compact and solid crust. Set aside.
In a large mixing bowl, use an electric mixer to beat the softened cream cheese on medium speed until it becomes smooth and creamy without any lumps.
Gradually sift in the powdered sugar while mixing on low speed. Then, add the pure vanilla extract, ground ginger, ground cinnamon, and ground nutmeg. Blend until all ingredients are thoroughly combined and the mixture is smooth.
In a separate bowl, whip the heavy whipping cream using a hand mixer until stiff peaks form. Carefully fold the whipped cream into the cream cheese mixture using a spatula, taking care not to deflate the whipped cream. Continue folding until the mixture is smooth and fluffy.
Gently drizzle the unsulfured molasses into the mixture, using the spatula to create a marbled effect without fully mixing in.
Spoon the cheesecake filling generously over the gingersnap crust in each cup, smoothing the top with a spatula for an even appearance.
Cover the cups with plastic wrap or a lid and refrigerate for at least 4 hours, or preferably overnight.
Just before serving, top each cheesecake cup with a sprinkle of crushed gingersnap cookies and a dollop of whipped cream, if desired.
Notes
For an extra festive touch, serve the cheesecake cups on a decorative platter with holiday-themed garnishes, like fresh mint leaves or cinnamon sticks.