Note
1. Make the NEPA-style Pizza Dough and portion it into two 450-gram pieces.
2. While the dough rests, make the mashed potatoes.
3. Bring the potato cubes to a boil, then reduce heat to medium and simmer for 10 to 15 minutes, or until they break apart when you poke them with a fork.
4. Place potatoes in a strainer to drain the water, let them air dry for a few minutes, then return them to the pot.
5. Add butter, cream cheese, evaporated milk, salt, pepper and granulated garlic, and mash using a metal masher.
6. Liberally grease a 10 x 14-inch pan with shortening or butter.
7. Preheat the oven to 700 °F (370 °C) as measured by an infrared thermometer in the center of the stone.
8. Bake for 2 minutes, rotate the pan 180 degrees and bake an additional 2 minutes.

9. Remove the pan from the oven and use an offset or metal spatula to retrieve the par-baked pizza “shell.

10. Flip the shell back over (right side up) and return it to the pan.
11. Using a large spoon or rubber spatula, spread mashed potatoes evenly across the entire crust, except for about ½ an inch at the edge of the pizza.

12. Once the stone temp reaches 700 °F (370 °C), turn off the oven flame, insert the pan and continue to cook with residual stone heat for an additional 4 to 6 minutes until the cheese is completely melted and the crust is golden brown.

13. Use an offset spatula to retrieve the pizza from the pan and put it on a cooling rack for 3 minutes.
14. Repeat the process for the second tray.