Creating Chocolate Orange Cheesecake is straightforward if you follow these simple steps:

1. Prepare the Crust: Preheat your oven to 350°F (175°C). In a mixing bowl, combine chocolate cookie crumbs, melted butter, and granulated sugar. Mix until well blended. Press the mixture firmly into the bottom of a 9-inch springform pan to form the crust.

2. Bake the Crust: Place the crust in the preheated oven and bake for 10 minutes. Remove from the oven and allow it to cool while you prepare the filling.

3. Make the Filling: In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy. Gradually add the granulated sugar and continue mixing until well combined.

4. Add Eggs: One at a time, add the eggs to the cream cheese mixture, beating well after each addition. Scrape down the sides of the bowl as needed.

5. Incorporate Other Ingredients: Add the sour cream, vanilla extract, orange zest, and fresh orange juice to the mixture. Mix until all ingredients are well incorporated.

6. Add Chocolate: Gently fold in the melted semi-sweet chocolate, ensuring it’s evenly distributed throughout the filling.

7. Pour into Crust: Carefully pour the cheesecake filling into the prepared crust. Smooth the top with a spatula.

8. Bake the Cheesecake: Bake in the preheated oven for 45-50 minutes, or until the edges are set and the center is slightly jiggly.

9. Cool: After baking, turn off the oven and crack the oven door. Allow the cheesecake to cool in the oven for 1 hour. Then, transfer it to the refrigerator to chill for at least 4 hours, or overnight for best results.

10. Prepare the Topping: Before serving, melt the remaining semi-sweet chocolate and drizzle it over the chilled cheesecake. Garnish with fresh orange zest and chocolate shavings, if desired.