It also has oregano and garlic in the dough. It is then parbaked before forming the discs.
The Buitoni toaster pizza shell is not crimped as shown in the link of reply#2.
Instead, the shell more resembles that of a Thomas English muffin where one side is perfectly flat and the other side is flat but the edges are rounded. But it's also thinner than an english muffin and has a harder stiffer crust.
So the first mystery to solve is how to form that shell. How do we seal the top & bottom parts if it's par baked? Why does the original Buitoni shell have that english muffin characteristic shape?
Perhaps we can begin by using a small 6" dia cast iron fry pan to form the bottom, fill it, and then attach the top cover. Parbake just enough to stiffen the bottom, then flip over and transfer to a hot flat grill to parbake the top. Now it could be frozen for baking later, or baked immediately in the toaster oven.
To me the method of assembly, par bake and toasting is first priority to figure out. We could begin with any dough formulation and fine tune the dough formula later.
---pete---