Recipe for Potato Knish: Golden Crust With Savory Filling

This potato knish delivers a golden crust with a rich, savory filling that’s both comforting and impressive. The dough comes together with simple ingredients, while the mashed potato filling gets its depth from caramelized onions and a touch of garlic.

I’ve refined this method to ensure the crust stays flaky and the filling perfectly seasoned. The key is working with cold dough and sealing the edges tightly to prevent leaks during baking.

What you’ll get is a hand-held pastry with a crisp exterior and a creamy, hearty center. Each bite offers the perfect balance of textures and flavors—ideal for a satisfying meal or snack.

Serve warm for the best experience. This recipe makes enough to share or save for later.

Ingredients for Recipe for Potato Knish

Simple pantry staples create this crisp, comforting pastry with a creamy potato center.

The dough hinges on cold ingredients. Land O’Lakes unsalted butter gives the flakiest layers, and full-fat sour cream adds that signature tang—don’t substitute low-fat. For the flour, King Arthur or any all-purpose works; just ensure it’s fresh (old flour loses lift). Russet potatoes are ideal for their high starch content, which makes the filling light and fluffy rather than dense.

No sour cream? Greek yogurt at the same amount works in a pinch. Swap the butter for vegetable shortening if needed, though the flavor won’t be as rich. Yellow onion is standard, but sweet onions caramelize faster. For extra depth, add a pinch of nutmeg to the filling. The egg wash is optional but gives that golden sheen mentioned in the intro.

Assembled knish can rest in the fridge for 12 hours before baking. Baked pastries keep 3-4 days in an airtight container or freeze for 2 months. Reheat in the oven to restore the crust’s crispness—microwaving makes it soggy.

Step-by-Step Instructions for Potato Knish

This method ensures a flaky crust and rich filling with every golden bite.

Step 1: Prepare the Dough

In a food processor, pulse the 3 cups All-Purpose Flour, 0.5 cup Unsalted Butter (cold and cubed), and ½ tsp Salt until the mixture resembles coarse crumbs. The butter should remain visible in pea-sized pieces—this creates the flaky layers.

Add the 0.5 cup Sour Cream and 0.25 cup Cold Water, then pulse just until the dough comes together. It will be slightly sticky but should hold when pressed. Turn it out onto a floured surface, divide into two equal portions, flatten into discs, and wrap in plastic. Refrigerate for 1 hour—this chilling step is crucial for easy rolling and a tender crust.

Step 2: Make the Potato Filling

Boil the 2 lb Russet Potatoes (peeled and diced) in salted water until fork-tender, about 10-12 minutes. Drain thoroughly and return to the pot. Mash until smooth but with some texture remaining.

Meanwhile, heat the 2 tbsp Vegetable Oil in a skillet over medium heat. Add the 1 whole Yellow Onion (thinly sliced) and cook for 8-10 minutes until golden brown. Stir in the 3 cloves Garlic Cloves (minced) and cook for 1 minute until fragrant. Fold this mixture into the mashed potatoes along with ½ tsp Salt and 0.5 tsp Black Pepper. Let cool completely.

Step 3: Assemble and Seal the Knish

On a floured surface, roll one dough disc into a 12-inch circle, about ⅛-inch thick. Spread half the potato filling evenly over the dough, leaving a 1-inch border. Brush the edges with some of the beaten 1 whole Large Egg.

Roll out the second dough disc to the same size and place it over the filling. Press the edges together firmly, then crimp with a fork to seal. Transfer to a parchment-lined baking sheet. Brush the top with the remaining egg wash for a golden finish.

Step 4: Bake to Perfection

Preheat the oven to 375°F. Bake the knish for 40-45 minutes until the crust is deep golden brown and the filling is heated through. Rotate the baking sheet halfway through for even browning.

Remove from the oven and let rest for 10 minutes before slicing. This resting period allows the filling to set slightly, making it easier to serve. Garnish with 2 tbsp Fresh Parsley (chopped) for a pop of color and freshness.

Best Sauces and Condiments for This Recipe

Classic Applesauce

Applesauce is the traditional pairing for knish, balancing the richness with its sweet-tart flavor. I prefer unsweetened applesauce to let the potato filling shine. Serve it chilled for a refreshing contrast to the warm pastry.

Spicy Brown Mustard

For a bolder kick, spread 1 tsp spicy brown mustard on each slice. The tangy heat cuts through the buttery crust beautifully. Maille or Pommery brands offer the perfect balance of spice and depth.

Creamy Horseradish

Mix 2 tbsp prepared horseradish with 1 tbsp sour cream for a zesty dip. This adds a sharp, pungent note that complements the savory filling. I love how it clears the palate between bites. 💛

Garlic Aioli

Blend ½ cup mayo with 1 minced garlic clove and 1 tbsp lemon juice for a creamy, garlicky sauce. It adds luxury to every bite. Use Hellmann’s mayo for the best texture.

Simple Butter

Sometimes less is more. A thin spread of salted butter on warm knish lets the flavors speak for themselves. I use Plugrá European-style butter for its rich, velvety finish.

Fresh Herb Garnish

Sprinkle with extra chopped parsley or fresh dill before serving. The brightness enhances the dish without overpowering it. This simple touch elevates the presentation. 🌟

Frequently Asked Questions