Preheat oven to 350°F. Lightly spray a (24 count) mini-muffin pan with vegetable spray.
In a medium mixing bowl, using an electric mixer, blend together the cream cheese, egg, ⅓ cup granulated sugar, and salt until smooth. Using a rubber spatula, fold in the chocolate chips. Set aside.
In a clean medium mixing bowl, combine all the chocolate cake ingredients. Gently blend (using clean beaters or a wooden spoon) until the mixture is smooth and all ingredients are incorporated.
Scoop 1 tablespoon of the chocolate mixture into the wells of the muffin tin. Allow the chocolate "bottoms" to rest for 5 minutes. Scoop 1 teaspoon of the cheesecake mixture into the center of the chocolate cake.
Bake for 20-25 minutes or until done. Immediately remove the mini Black Bottoms from the pan and cool on a wire rack. Repeat with remaining batter until all Black Bottoms are baked.
Store in an airtight container at room temperature or for longer storage, in the refrigerator.
Notes
I use just one 24-count mini muffin pan. After baking the first batch, I cool the pan enough to pick up then wipe out the cups with a paper towel. I redcoat the pan with vegetable spray to prevent sticking of the second batch. Continue with the remaining batter.
If using mini-paper liners, be sure to spray with vegetable cooking spray.
Nutrition information is calculated using an ingredient database and should be considered an estimate. When multiple ingredient alternatives are given, the first listed is calculated for nutrition. Garnishes and optional ingredients are not included.