Make or purchase from a pizza place your pizza dough.
Use leftover mashed potatoes or boil the potatoes in salted water for 20 minutes or until tender and ready to mash. Drain.
While the potatoes are cooking, cook your bacon until crispy, when the bacon cools, crumble and set aside.
In a lightly greased round baking dish, pie or cake pan (6-8 inches in diameter, no more than 2 inches deep) spread the pizza dough evenly going up the sides of the dish at least halfway.
Mash your potatoes while adding in your butter, milk, salt and pepper.
Spread mashed potatoes over the dough, sprinkle with half the cheese and bake for 15 20 minutes at 400 degrees.
Pull it out, add the rest of the cheese and the bacon and put back in the oven just until the cheese melts. Top with whatever else you enjoy and serve after it rests for 5 minutes or so to firm up a bit.