Preheat your oven to 325°F (163°C). Grease a 9-inch springform pan and line the bottom with parchment paper.
In a medium bowl, mix the graham cracker crumbs, sugar, cinnamon, and melted butter. Press this mixture into the bottom of the prepared pan. Chill in the refrigerator.
In a large bowl, beat the softened cream cheese and sugar until smooth. Add the eggs one at a time, mixing just until combined. Stir in the vanilla extract and sour cream until everything is smooth.
In a small bowl, mix the melted butter, brown sugar, and cinnamon.
Pour half the cheesecake filling over the crust and drizzle half of the cinnamon mixture on top. Use a knife to swirl it gently into the batter. Repeat with the remaining cheesecake and cinnamon mixture.
Bake for 45 to 50 minutes, until the center is set but slightly jiggly. Turn off the oven, crack the door, and let the cheesecake cool for 1 hour.
Refrigerate for at least 4 hours or overnight.
For the glaze, whisk together the powdered sugar, milk, and vanilla until smooth. Drizzle this over the chilled cheesecake before slicing.