Preheat the oven to 400 F.
Set the cream cheese, sour cream, cinnamon, allspice, and salt in the bowl of a stand mixer. Affix the paddle attachment and begin mixing on the lowest speed: the goal is not to whip any air into the cream cheese but to soften and mix the spices into it. Once it’s creamy, add the sugar, vanilla, and reduced cider. Beat on low again, to just combine the ingredients together. Stop the mixer to scrape down the sides and bottom of the bowl, to ensure even mixing.
Separately, whisk the eggs together - use a fork or an immersion blender to break up the eggs and beat until smooth, like you would for an omelet. Add the eggs to the bowl and beat to just combine, also on low speed.
Pour in the heavy cream, flour and cornstarch and beat until the batter is smooth: stop to scrape down the bowl and mix again.
Set a sieve over the parchment lined springform pan and pour the cheesecake batter through it, stirring and pressing to get all the batter through the sieve. This will take care of any lumps in the batter that weren’t mixed in.
Carefully transfer the cheesecake to the oven, on the middle rack. Bake until the top is a deep brown color, the sides are set and there is a noticeable jiggle/wobble in the center, about 45-50 minutes. If you want to check with an instant read thermometer, insert it into the center - the temperature should be about 150-155 F. If you'd like an extra charred top raise the temperature to 425 F for the last five minutes of baking. Let the cheesecake cool fully on the counter, the middle will sink considerably. Once cool enough to handle, transfer to the fridge to chill for about 6-8 hours before serving.