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The Recipe · No.595 · Potato Knish

Potato Knish, and where to source it

Potato Knish — 5best2buy.com 5BEST2BUY.COM Potato Knish Jewish 5best2buy.com

A knish is mashed potato and fried onion in a thin sturdy dough, so the filling has to be well-seasoned and dry enough to hold a shape. Fry the onions deep golden before they go in; that sweetness is what makes a plain potato filling worth the wrapping.

By Vince Gonzalez · Published July 2026 · Sourcing verified 5 Jul 2026

Prep40 min
Cook45 min
Makes8 knishes
CuisineJewish
Cost$
Contains  dairy · eggs · gluten
Make it gluten-free: swap in a gluten-free flour blend (check the other labels too).
The Ingredients — and where to get them
Cook for 8 knishes
Russet potatoes
Starchy potatoes mash dry and fluffy so the filling is not gluey.
2 lb
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Onion
Fried slow to deep gold, it is the whole flavor of the filling.
2 large
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Flour
All-purpose makes a thin sturdy dough that stretches over the filling.
3 cups
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Eggs
One in the dough for stretch, one beaten for the wash.
2
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Butter or schmaltz
Enriches the mashed potato; schmaltz is the deli-classic fat.
4 tbsp
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The Rundown
Greedometer ●●●●● A fair little treat
A reasonable little indulgence.
EffortSome doing
Cook it with
Air fryerSheet pan
The Method
  1. Make doughKnead flour, egg, oil, water, and salt to a smooth stretchy dough; rest 30 minutes covered.
  2. FillingMash boiled potatoes with the deep-fried onions, fat, and heavy salt and pepper until dry and fluffy.
  3. Fill and rollRoll the dough paper-thin, pipe potato in a log, and roll up; pinch off into rounds and tuck the ends.
  4. BakeBrush with egg wash and bake at 375F until the dough is deep golden, about 40 minutes.
The Toolkit

Potato ricer · Rolling pin · Half sheet pan · Bench scraper · Pastry brush

Straight Answers
Can you make Potato Knish in an air fryer? — Yes

Yes — bake it in a small pan or dish that fits the basket, at about 25°F below the recipe temperature. Air fryers run hot and fast, so check it early; no flipping needed.

Can you freeze Potato Knish? — Yes

Yes — freeze it well-wrapped, then reheat or toast straight from frozen. Frost or glaze after thawing.

Can you make Potato Knish ahead of time? — Yes

Yes — bake it a day or two ahead; it keeps well-wrapped at room temperature and freezes cleanly. Add any frosting or glaze close to serving.

Is Potato Knish gluten-free? — Not as written

Not as written — it contains gluten. Make it gluten-free: swap in a gluten-free flour blend (check the other labels too).

Is Potato Knish vegan? — No

No — it contains meat, so it isn’t vegetarian or vegan.

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