ISO: chocolate pudding cake

Growing up my mother used to make a chocolate cake and it had pockets of warm dark chocolate pudding. We would eat it warm or hot right out of the oven. She insists it was a box mix, but I know it had to have been something else. Maybe it was something she made up she doesn't remember... I checked all of the cake recipes listed here and can't find anything that sounds close. Has anyone heard of such a cake? It was such a wonderful dessert and I would love to make it for my kids now too. Thanks to anyone who can help!