01 -
Mix chocolate cake batter following package directions.
02 -
Grease a 23x33 cm baking pan and pour in the prepared batter.
03 -
Melt butter in a microwave-safe bowl, then stir in softened cream cheese, peanut butter, and vanilla extract until smooth.
04 -
Incorporate powdered sugar into the peanut butter mixture until fully combined.
05 -
Drop spoonfuls of the peanut butter mixture over the cake batter, then evenly sprinkle chocolate chips and mini Reese's peanut butter cups on top.
06 -
Bake in a preheated oven at 175°C for 45 to 50 minutes.
07 -
Remove from oven and allow to cool slightly before serving.