01 -
Prepare the chocolate cake mix according to the package instructions in a 9×13-inch (23×33 cm) baking pan. Bake as directed and let cool for about 10 minutes.
02 -
Using the handle of a wooden spoon or a straw, poke holes all over the surface of the warm cake, spacing them about 1 inch apart.
03 -
In a medium bowl, whisk together the sweetened condensed milk and melted peanut butter until smooth. Pour the mixture evenly over the cake, ensuring it fills the holes. Allow the cake to cool completely at room temperature or in the refrigerator.
04 -
Once the cake is fully cooled, spread the whipped topping evenly over the surface.
05 -
Sprinkle the top with mini chocolate chips or chocolate shavings, followed by the chopped Reese's or peanut butter cups.
06 -
Refrigerate the cake for at least 1 hour before serving to let the flavors meld together. Slice and enjoy!