Step 1: Preheat your oven to 325°F (160°C) to ensure even baking.
Step 2: Line a 12-cup muffin tin with paper liners for easy removal.
Step 3: Crush the Chocolate Oreos in a mixing bowl until they resemble fine crumbs. Divide the crumbs among the muffin cups and press down to form the crust.
Step 4: Beat the softened cream cheese with an electric mixer until smooth. Gradually add sugar, cocoa powder, and vanilla, mixing until incorporated.
Step 5: Add the egg and beat until just combined. Then, add red food coloring drop by drop until you reach your desired shade.
Step 6: Gently fold in Nutella to create a marbled effect in the batter.
Step 7: Spoon the cheesecake mixture over the crusts, filling each muffin cup about 3/4 full.
Step 8: Bake for 18-20 minutes until set but slightly jiggly in the center.
Step 9: Cool at room temperature for 10 minutes, then chill in the refrigerator for at least 2 hours before serving.