Step 1: Prepare the Brownie Base

1. Preheat your oven to 350°F (175°C). Grease a 9-inch springform pan or line it with parchment paper.
2. Prepare the brownie batter according to the box instructions.
3. Pour the batter into the prepared pan and bake for 20–25 minutes, or until a toothpick inserted comes out slightly fudgy. Remove from the oven and let cool.

Step 2: Make the Cheesecake Layer

1. In a large bowl, beat the softened cream cheese and sugar together until smooth.
2. Add the eggs, one at a time, mixing well after each addition.
3. Stir in the vanilla extract, sour cream, and heavy cream until fully combined.

Step 3: Assemble and Bake

1. Pour the cheesecake batter over the cooled brownie base, spreading it evenly.
2. Wrap the bottom of the springform pan in aluminum foil to prevent leaks. Place the pan on a baking sheet.
3. Bake at 325°F (160°C) for 50–60 minutes, or until the cheesecake is set but still slightly jiggly in the center.
4. Turn off the oven and leave the cheesecake inside with the door slightly open for 1 hour to cool gradually.

Step 4: Add the Caramel Topping

1. Once the cheesecake has cooled completely, drizzle the caramel sauce evenly over the top.
2. Refrigerate for at least 4 hours, preferably overnight, to allow the flavors to meld.