01 -
Preheat your oven to 175°C (350°F) and grease a 9x13-inch baking dish.
02 -
In a large mixing bowl, combine the chocolate cake mix, vegetable oil, milk, eggs, and vanilla extract. Mix until well combined.
03 -
Pour half of the batter into the prepared baking dish and spread it evenly.
04 -
Drop spoonfuls of peanut butter over the batter, then sprinkle half of the chocolate chips and chopped peanut butter cups on top.
05 -
Pour the remaining cake batter over the peanut butter layer and smooth it out.
06 -
Top with the remaining chocolate chips and peanut butter cups.
07 -
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
08 -
Allow the cake to cool slightly before dusting with powdered sugar, if desired, and serve warm.