Step 1: Make the Cheesecake Layer

1. Preheat the oven to 325°F (160°C). Grease a 9-inch springform pan and line the bottom with parchment paper.
2. Beat cream cheese and sugar together until smooth. Add eggs, one at a time, followed by sour cream and vanilla.
3. Pour the batter into the prepared pan and bake for 40–45 minutes, or until the center is set. Cool completely and refrigerate.

Step 2: Prepare the Cinnamon Cake Layers

1. Preheat the oven to 350°F (175°C). Grease and line two 9-inch round cake pans.
2. In a medium bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.
3. In a large bowl, cream butter and sugar until fluffy. Beat in eggs one at a time, followed by vanilla.
4. Alternate adding dry ingredients and buttermilk to the butter mixture, starting and ending with dry ingredients.
5. Divide the batter evenly between the pans and bake for 25–30 minutes. Let cool completely.

Step 3: Make the Cinnamon Swirl

1. Combine melted butter, brown sugar, and cinnamon in a bowl. Mix until smooth.

Step 4: Assemble the Cake

1. Place one cinnamon cake layer on a serving plate. Spread half the cinnamon swirl mixture on top.
2. Add the cheesecake layer and spread the remaining cinnamon swirl mixture over it.
3. Top with the second cinnamon cake layer.

Step 5: Frost and Decorate

1. Beat cream cheese and butter together until smooth. Gradually add powdered sugar, milk, and vanilla.
2. Spread the glaze over the cake, letting it drip down the sides. Optionally, garnish with a sprinkle of cinnamon or a cinnamon stick for flair.