Step 1: Prepare the Cookie Crust

1. Preheat the oven to 325°F (163°C).
2. Grease a 9-inch springform pan and line the bottom with parchment paper.
3. Press the chocolate chip cookie dough evenly into the bottom of the pan.
4. Bake for 10 minutes, then let it cool slightly.

Step 2: Make the Cheesecake Filling

5. In a large mixing bowl, beat the cream cheese and sugar until smooth.
6. Add the eggs one at a time, mixing just until combined.
7. Stir in the sour cream and vanilla extract.
8. Gently fold in the chocolate chips.

Step 3: Assemble & Bake

9. Pour the cheesecake batter over the cooled cookie crust and smooth the top.
10. Bake for 50-55 minutes, until the edges are set and the center has a slight jiggle.
11. Turn off the oven and let the cheesecake cool inside with the door slightly open for 1 hour.
12. Refrigerate for at least 4 hours before serving.

Step 4: Add Toppings & Serve

13. Drizzle melted chocolate over the cheesecake.
14. Add whipped cream or extra chocolate chips if desired.
15. Slice and enjoy!