1️⃣ Prepare the cake according to the box instructions and bake in a 9×13” pan at 350°F for 22-28 minutes. Let cool for 10 minutes.
2️⃣ While warm, poke holes all over the cake using the end of a wooden spoon.
3️⃣ Heat the hot fudge in the microwave for about 30-60 seconds, then pour it over the cake, letting it soak in. Save some for topping.
4️⃣ Prepare the first pudding mix by whisking it with 1¾ cups of milk. Pour it over the cake before it sets. Refrigerate for 15 minutes.
5️⃣ Prepare the second pudding mix and let it set in the fridge separately.
6️⃣ Crush ¾ of the Oreos in a large Ziploc bag using a rolling pin.
7️⃣ Mix the set pudding with Cool Whip, then fold in the crushed Oreos. Spread this mixture over the cake.
8️⃣ Drizzle with extra hot fudge and sprinkle with remaining Oreos. Serve chilled and enjoy!