Preheat the oven to 325 degrees.
Line or grease a 9 inch springform pan with parchment or baking spray. Set aside.
Combine the graham crackers, cinnamon, and butter in a small bowl. Mix until you get a wet sand like mixture.
Press firmly, using the bottom of a measuring cup or bowl, into the bottom of your pan until evenly distributed. Set aside.
Combine the cream cheese, sugar and milk in a large mixing bowl, or the bowl of an electric mixer.
Beat with a hand mixer, or paddle attachment, on medium speed until fully incorporated and slightly fluffy, about 2 minutes.
Stir in the eggs, one at a time, switching to a whisk to mix by hand.
Scrape the sides of the bowl and gently mix to incorporate any items that stuck to the side.
Fold in the sour cream, vanilla, and flour, using the whisk or a silicone spatula. Try not to over mix and only gently stir until combined.
Pour into the prepared baking dish.
Bake for 1 hour. Turn off the oven and let the cake rest inside until cooled to room temperature.
Transfer the cake to the refrigerator to chill for at least 4 hours, or up to overnight, before removing from the pan.
Gently run a knife around the outside of the pan. Release the sides and remove the cheesecake from the dish.
Slice and serve.