01 -
Preheat the oven to 175°C (350°F). Lightly grease a 23x33 cm (9×13-inch) glass baking dish to ensure even heat distribution. Alternatively, a metal pan can be used with careful baking time monitoring.
02 -
Prepare the chocolate cake mix following the instructions on the box, incorporating water, oil, and eggs as specified. Pour the smooth batter into the prepared baking dish.
03 -
In a large mixing bowl, beat softened cream cheese and melted butter until smooth. Incorporate peanut butter and vanilla extract, mixing until fully combined. Gradually beat in powdered sugar, one cup at a time, until the mixture becomes thick and fluffy.
04 -
Spoon dollops of the peanut butter cream mixture over the cake batter in the dish, creating swirls without fully mixing it into the batter.
05 -
Sprinkle chocolate chips and halved mini Reese’s cups on top of the cake. Slightly press some pieces into the batter but leave others visible for presentation.
06 -
Bake the cake for 45–55 minutes. Check for doneness when the edges are set, the top is cracked, and the center is just firm with a slight jiggle. It will set further as it cools.
07 -
Allow the cake to cool slightly before serving. For a warm and gooey texture, serve immediately, or refrigerate after cooling to achieve cleaner slices.