Baked Pierogi Casserole with Potato, Cheese, and Caramelized Onions

By AislePrompt Editorial · Published 2026-06-26 · Updated 2026-06-26

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Layers of tender pierogi, creamy mashed potatoes, melted cheese, and sweet caramelized onions baked to golden perfection. This Ukrainian-inspired comfort-food recipe, ready in about 60 minutes, layers frozen potato pierogi, yellow onion, unsalted butter into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 480 calories and feeds 6, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 20 min Cook: 40 min Serves 6 Ukrainian cuisine 480 cal/serving

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Ingredients

24 pieces frozen potato pierogi
2 large, thinly sliced yellow onion
4 tbsp unsalted butter
1 cup sour cream
2 cups shredded sharp cheddar cheese
1 tsp salt
1/2 tsp black pepper
2 tbsp for garnish chopped chives

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Instructions

Step 1: Preheat oven to 375°F. Bring a large pot of salted water to a boil and cook 24 frozen potato pierogi for 3-4 minutes until they float to the surface. Drain well.
Step 2: In a large skillet, melt 4 tablespoons unsalted butter over medium heat. Add 2 large thinly sliced yellow onions and cook for 15-20 minutes, stirring occasionally, until onions are deeply caramelized and golden brown.
Step 3: In a 9x13-inch baking dish, spread a thin layer of sour cream (about 1/4 cup), then arrange half of the cooked pierogi in a single layer. Sprinkle 1 cup shredded sharp cheddar cheese evenly over the pierogi.
Step 4: Add half of the caramelized onions over the cheese, then layer the remaining pierogi on top. Spread the remaining sour cream (3/4 cup) over the pierogi and sprinkle with the remaining 1 cup cheddar cheese.
Step 5: Season with 1 teaspoon salt and 1/2 teaspoon black pepper evenly over the top. Bake uncovered for 25-30 minutes until the cheese is bubbly and golden.
Step 6: Garnish with 2 tablespoons chopped chives before serving warm.