I dont necessarily have a recipe...BUT...I do have an incredible place you should check out. Crumb Cake Creations makes an assortment of different crumb cakes in a "new jersey style" with big crumbs and super-moist cake. The pumpkin crumb cake is my favorite. Check them out at :Crumb Cake Store
I wish I had the recipe myself!
OMG...I thought I was the only one who noticed that.....I think what he does is just throws on the cake scraps to make the topping....I have found several recipes but none have cake crumbs in the topping I think you just have to experiment witht he recipe...