Prepare the crust by mixing graham cracker crumbs, melted butter, sugar, and cinnamon. Press into a 9-inch springform pan and bake at 325°F for 10 minutes. Let cool.
Beat softened cream cheese until smooth. Add sugar, sour cream, eggs, vanilla, and cinnamon. Mix until smooth.
Combine melted butter, brown sugar, and cinnamon for the swirl mixture.
Pour half the cheesecake batter into the crust, drizzle with half the swirl mixture, and swirl with a knife. Repeat with remaining batter and swirl.
Bake at 325°F for 55-60 minutes. Cool in the oven with the door cracked, then chill for 4 hours. Glaze with powdered sugar, milk, and vanilla before serving.
Notes
For a smooth cheesecake, avoid overmixing the batter and ensure all ingredients are at room temperature.