Purchase chocolate wafers to crush for the recipe. Look for them in slim boxes at the grocery store near cookies, baking ingredients and/or ice cream toppings. Or, use chocolate cookie crumbs found in the baking aisle of the grocery store.
Let the cheesecake stand at room temperature for 15 minutes before cutting and serving it; the stand time helps the fudge adhere to the cake.
To make buffet service easy, pre-cut the cheesecake squares in the pan.