Preheat your oven to 325°F (160°C). Line the muffin tin with paper liners.
In a mixing bowl, combine the graham cracker crumbs, cocoa powder, granulated sugar, and melted butter. Stir until well mixed.
Press about 1 tablespoon of the crust mixture into the bottom of each paper liner in the muffin tin. Press down firmly to form an even layer.
In another bowl, beat together the softened cream cheese and granulated sugar with an electric mixer until smooth and creamy.
Add the eggs one at a time, mixing well after each addition. Then mix in the vanilla extract and sour cream until fully incorporated.
Divide the cheesecake filling evenly on top of the crusts in the muffin tin. Fill each cup almost to the top.
Bake in the preheated oven for about 20 minutes, or until the cheesecakes are set around the edges but still slightly jiggly in the center.
Remove from the oven and allow to cool to room temperature. Transfer them to the refrigerator and chill for at least 2 hours.
Before serving, melt the chocolate chips in a small saucepan over low heat, stirring until smooth.
Drizzle the melted chocolate, chopped pecans, and caramel sauce over the cheesecakes before serving.