Step 1: Prepare the Gingersnap Crust: Preheat oven to 350°F (175°C). Mix crushed gingersnaps, sugar, and melted butter in a bowl until combined. Press mixture firmly into the bottom of a 9-inch springform pan. Bake for 8–10 minutes, then set aside to cool.
Step 2: Make the Cheesecake Filling: In a large bowl, beat cream cheese until smooth and creamy. Add sugar and continue beating until fully incorporated. Beat in eggs, one at a time, followed by vanilla extract. Mix in eggnog, nutmeg, cinnamon, and flour until smooth.
Step 3: Bake the Cheesecake: Pour filling over cooled gingersnap crust. Place the cheesecake in a preheated oven at 325°F (160°C). Bake for 50–60 minutes or until the edges are set but the center slightly jiggles. Turn off the oven and let cheesecake sit inside for 10 minutes, then remove and cool to room temperature.
Step 4: Chill the Cheesecake: Refrigerate cheesecake for at least 4 hours or overnight for best results.
Step 5: Prepare the Topping: Whip heavy cream with powdered sugar and vanilla until soft peaks form. Spread or pipe over chilled cheesecake and sprinkle with ground nutmeg.