Mashed Potato Pizza: The Best Use of Thanksgiving Leftovers

Every year the same thing happens at my house. Somebody makes twice the mashed potatoes anyone could eat, and by Friday there’s a container in the fridge that’s set up like spackle. You can microwave it into sadness, or you can put it on pizza.

Mashed potato pizza is a white pie with dollops of mash in place of tomato sauce, usually with garlic, mozzarella and bacon. It sounds like a dare. It isn’t. New Haven’s Bar has been selling a version for decades, and pizzerias like Otto have shared theirs with the trade press.

The catch is that leftover mash isn’t the same stuff it was on Thursday. It’s colder, drier and much stiffer, and that changes how it bakes. Here’s how to fix it, how much to use, and the recipe I keep coming back to.

Why Potato on Pizza Works

Starch on starch sounds like a mistake until you remember garlic bread exists. Potato brings creaminess and a mild, buttery backdrop, and the crust brings char and chew. Put a salty, smoky topping on it and the whole thing tastes like a loaded baked potato with better architecture.

The most famous example lives in Connecticut. Saveur called Bar’s mashed potato pie New Haven’s secret handshake, and the order regulars recommend is a white pie with garlic and mozzarella, with bacon optional. Saveur describes the potatoes as airy, not overly buttery, and not piled on with abandon. That last part is the whole lesson in six words.

If you’ve read our piece on New Haven’s thin, charred apizza, you already know the crust there is thin and foldable. That’s what makes potato work. A thick, bready base under a layer of mash is a lot of carbs and not a lot of crunch.

The Cold Mash Problem

Fresh mashed potatoes are soft and spoonable. After a night in the fridge they firm up into a dense block, and if you spoon that straight onto dough you get cold lumps that heat through slowly and never really brown. The fix is to warm and loosen the mash before it touches the pizza.

Pizzerias build their potato mix to be spreadable on purpose. The mashed potato topping Otto Pizza shared with Pizza Today finishes a 12-pound batch of potatoes with half a pound of butter and a cup of heavy cream. That’s a loose, rich mash by design, not a stiff one.

At home I microwave the leftovers for about a minute, stir in warm milk or cream a tablespoon at a time, and stop when the potatoes hold soft peaks on a spoon. If your family’s mash was already heavy on sour cream or cream cheese, you’ll need less. FYI, if the leftovers are gluey from overmixing, no amount of milk will save them. Use them in a soup and buy a couple of russets.

Three Ways Recipes Handle It

I read through eight of the recipes ranking for mashed potato pizza right now. They split into three camps, and the differences matter more than the toppings.

IMO the first camp wins. Raw dough on a preheated stone gets the bottom crisp while the potato tops brown, all in one bake. The par-bake route is a good fallback if you’re using a store crust or a dense mash. The mash-as-crust idea is tasty, but it’s a casserole wearing a pizza costume.

The other split is butter. Ooni’s Robuchon-style mashed potato pizza works ⅔ cup of butter into 1½ pounds of potatoes, in honor of the French chef famous for absurdly rich puree. It’s glorious, but your Thanksgiving leftovers already carry plenty of fat. Don’t add more.

How to Build the Pie

Start with garlic, not tomato

Brush the stretched dough with garlic oil, or go further with a few cloves of sweet, spreadable roasted garlic. This is a white pie at heart, the same family as a classic pizza bianca. Red sauce makes the potato taste confused.

Cheese goes down first

A layer of low-moisture mozzarella goes on before the potato so it melts into the gaps and glues everything down. Grate it from a block. Bagged shreds carry an anti-caking coating that keeps them from melting smoothly, and our mozzarella buying guide covers which blocks to grab.

Get the amount right

Pizza Today’s mashed potato pizza with salsa verde uses 12 ounces of potato mix on a 19-ounce dough ball, baked at 500°F for 12 to 15 minutes. Scale that to a standard 1-pound home dough ball and you land right around 10 ounces of mash. That’s about 1¼ cups, spread as spoonfuls with crust showing between them.

Too much potato is the most common way this goes wrong, and it’s the same trap behind most soggy-topping disasters. Mash holds water. Pile it on and the dough under it steams instead of bakes.

Turning It Into a Full Leftovers Pizza

Mash and bacon is the classic, but the day after Thanksgiving the whole fridge wants in. A handful of shredded turkey goes on with the bacon. A thin drizzle of warmed gravy goes on after the bake, because gravy in a 500°F oven turns to glue. Little dots of cranberry sauce on the finished pie are optional and divisive, which is exactly how my family likes its arguments.

If you want more ideas from the same fridge, our roundup of Thanksgiving pizza ideas has six more ways to use the leftovers, and the holiday pizza list carries you into December.

One rule overrides all of this. According to USDA’s guidance on holiday leftovers, leftovers keep three to four days in the fridge or three to four months in the freezer, and anything left out more than two hours at room temperature gets tossed. When you reheat leftovers, they should hit 165°F. A 500°F oven and a fully browned potato top will get you there.

Tips Worth Stealing

The Recipe