Preheat the oven to 325°F (160°C) and line a muffin tin with cupcake liners. Combine graham cracker crumbs, sugar, cinnamon, and melted butter until the texture resembles damp sand. Press about 2 tablespoons into each liner, bake for 5 minutes, and let cool completely.
Beat cream cheese and sugar until smooth, then add eggs one at a time. Mix in sour cream and vanilla just until combined. Avoid overmixing to keep the batter light.
In a small bowl, mix brown sugar, cinnamon, and melted butter into a thick, drizzleable paste.
Fill each liner about three-quarters full with cheesecake batter, then add a few small dollops of the cinnamon paste on top. Swirl gently with a toothpick for a marbled effect.
Bake for 18–22 minutes, until set but slightly jiggly in the center. Turn off the oven, crack the door, and let rest inside for an hour.
Chill for at least 3 hours or overnight. Top with cream cheese frosting or whipped cream, and dust lightly with cinnamon before serving.