I tried eating a custom-made "stuffed crust pizza" the other day at Bellissima in Northeast Philly. It's not on their menu so you will have to ask if they could make it for you. If you don't know about the stuffed crust pizza, it was made famous by Pizza Hut. Basically, they stuffed the crust with melted cheese. It is so delicious, and if you have never tried it, you should ask for one!
You can ask for other ingredients in there as well, such as pepperoni. I like to eat stuffed crust pizza backwards because the crust is my favorite part. I will see if I can get other special pizzas made in there next time.