Set oven rack to lowest position, preheat oven to 475° F degrees. (Oven should be clean to prevent smoking at high temperatures.)
Fill a small saucepan halfway with water; bring to a boil over medium-high heat. Cook the potatoes in boiling water for 6 minutes or until tender. Drain well and set aside.
With floured hands, on a floured counter or board, pinch and pat dough from the center to outside to make a 12 - 14-inch circle. Spray pizza pan with cooking spray. Place dough circle on prepared pan, pressing the edges of dough onto the lip of the pan.
Evenly distribute potatoes and marinara sauce over the dough; top with cheese and optional ingredients, if desired. Bake for 20 minutes or until crust is puffed and brown and cheese is completely melted. Cut into wedges.