For the Crust:

1. 1. Preheat your oven to 325°F (163°C). Line an 8×8-inch baking pan with parchment paper.
2. 2. In a bowl, mix graham cracker crumbs, melted butter, and sugar until well combined.
3. 3. Press the mixture firmly into the bottom of the prepared pan. Bake for about 10 minutes until lightly golden.

For the Filling:

1. 1. In a mixing bowl, beat softened cream cheese with an electric mixer until smooth.
2. 2. Gradually add granulated sugar while mixing on low speed until fully incorporated.
3. 3. Add eggs one at a time, beating well after each addition.
4. 4. Pour in eggnog, nutmeg, and cinnamon. Mix until just combined; avoid overmixing.
5. 5. Pour the filling over the pre-baked crust. Bake for 30-35 minutes or until set but slightly jiggly in the center.
6. Chill and Serve:
7. 1. Allow to cool at room temperature before refrigerating for at least two hours or overnight.
8. 2. Cut into squares and serve chilled with a drizzle of extra eggnog or whipped cream if desired.