Creating a luscious Chocolate Cheesecake is simpler than you might think. Follow these steps for a successful bake:

1. Preheat the Oven: Preheat your oven to 325°F (160°C). Prepare a 9-inch springform pan by spraying it with non-stick cooking spray or lining the bottom with parchment paper.

2. Make the Crust: In a bowl, combine chocolate cookie crumbs, 1/3 cup sugar, and melted butter. Mix until thoroughly combined. Press the mixture firmly into the bottom of the prepared springform pan.

3. Beat Cream Cheese: In a large mixing bowl, beat the softened cream cheese until smooth. It’s important to ensure there are no lumps for a creamy texture.

4. Add Sugar and Vanilla: Gradually add 1 cup of sugar and vanilla extract to the cream cheese. Mix until well combined.

5. Incorporate Eggs: Add the eggs one at a time, mixing just until incorporated after each addition. Do not overmix, as this can result in cracks in your cheesecake.

6. Add Sour Cream: Mix in the sour cream until smooth. This will add a lovely tanginess and creaminess to your cheesecake.

7. Blend in Melted Chocolate: Pour in the melted, cooled semi-sweet chocolate. Stir until everything is fully combined and the mixture is smooth and glossy.

8. Pour into Pan: Carefully pour the cheesecake batter into the prepared crust, smoothing the top with a spatula.

9. Bake: Bake in the preheated oven for 45-50 minutes, or until the edges are set but the center still has a slight jiggle. This is crucial for a creamy texture.

10. Cool Gradually: After baking, turn off the oven, crack the oven door, and allow the cheesecake to cool inside for about 1 hour. This helps prevent cracking.

11. Chill: Remove the cheesecake from the oven and refrigerate for at least 4-6 hours, or overnight, to allow it to set completely.

12. Prepare for Serving: Before serving, run a knife around the edge of the springform pan to loosen the cheesecake. Remove the sides of the springform pan.