Preheat oven to 350°F and grease a 9×13-inch baking dish.
Prepare the chocolate fudge cake batter as directed and pour it into the greased dish.
In a separate bowl, beat cream cheese, butter, peanut butter, and vanilla until smooth. Gradually mix in powdered sugar, one cup at a time.
Drop spoonfuls of the peanut butter mixture over the cake batter and gently spread.
Sprinkle Reese’s peanut butter cups and chocolate chips evenly on top.
Bake for 45-50 minutes, checking for doneness with a toothpick.
Serve warm with vanilla ice cream for an extra treat!
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