Potato Knish Casserole

Craving the golden, flaky goodness of a potato knish without spending all afternoon folding dough? This cozy casserole packs all the classic flavor of a traditional knish into a one-pan wonder—perfect for a relaxed weeknight or weekend treat.

📋 Ingredients

🍳 Instructions

1. Preheat & Prep
   Set oven to 350°F. Grease a 9×9-inch baking dish and set aside.
2. Sauté the Onions
   Melt butter in a saucepan over medium heat. Add diced onions and cook until caramelized—soft and golden brown, about 10 minutes. Season with salt and pepper. Remove from heat.
3. Cook the Potatoes
   Place potatoes in a large pot. Cover with water and add 1 tablespoon kosher salt. Bring to a boil, then simmer until fork-tender, about 10 minutes. Drain and transfer to a large mixing bowl.
4. Mash & Mix
   Mash potatoes until mostly smooth. Stir in sour cream, salt, and pepper. Fold in sautéed onions until evenly combined.
5. Assemble
   Spread the potato mixture into your prepared baking dish. Lay the defrosted pie dough on top, trimming as needed to fit.
6. Make the Egg Wash
   In a small bowl, whisk together egg, olive oil, and water. Brush over the pie crust for that irresistible golden finish.
7. Bake
   Bake for 25–30 minutes or until the crust is golden and crisp.
8. Serve & Savor
   Slice while warm and serve as a main dish or a hearty side. Pairs perfectly with a crisp salad or sour pickles.

👩‍🍳 Pro Tip

Want a deeper knish flavor? Add a pinch of ground mustard or swap sour cream for whipped cream cheese in the filling.