01 -
Preheat the oven to 350°F and grease a 9x13-inch baking dish with non-stick spray.
02 -
Whisk the milk with chocolate instant pudding mix in a large bowl until smooth and slightly thickened.
03 -
Add the chocolate cake mix directly to the pudding mixture and stir gently until just combined. Batter will be thick.
04 -
Fold most of the chopped mini Reese’s into the batter, reserving some for topping.
05 -
Pour the batter into the prepared dish and spread evenly. Sprinkle reserved peanut butter cups on top. Bake for 25 minutes or until a toothpick inserted in the center comes out clean.
06 -
Allow to cool slightly before serving warm or at room temperature.