Creamy Sour Cream and Onion Pierogi Casserole

This comforting pierogi and kielbasa casserole is an easy one-dish meal. Potato-filled dumplings and savory sausage are baked in a rich sour cream sauce.

By EasyCooks Kitchen

Published October 12, 20268 min read

Total time: 50 mins

Prep: 10 mins
Cook: 35 mins
Rest: 5 mins

Serves: 6; Makes one 9x13 inch casserole
Cuisine: Polish-American
Calories: 480; per serving, estimated

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A top-down view of a ceramic baking dish filled with potato pierogi, kielbasa coins

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Discover a simple way to elevate your weeknight dinner with this creamy pierogi and kielbasa casserole. By combining classic comfort foods into one baking dish, you create a hearty, flavorful meal that requires minimal effort. This recipe relies on the natural richness of sour cream and the savory depth of smoked sausage, resulting in a dish that feels both indulgent and home-cooked. Perfect for busy evenings when you need something satisfying without spending hours in the kitchen, this casserole is a reliable staple.

This pierogi and kielbasa casserole is an excellent example of how to combine simple ingredients for maximum comfort. The method uses the residual heat of the oven to meld the flavors, allowing the sour cream sauce to thicken and coat the tender pierogi. Because the pierogi are already cooked, the baking time is focused on heating the dish through and melting the cheese. This results in a cohesive meal that is easy to assemble and even easier to serve, making it a great option for family dinners or casual gatherings.

The appeal

Why you’ll love it

The method of baking these ingredients together allows the onion-infused sour cream to act as both a sauce and a cooking medium. As the casserole heats, the sour cream reduces slightly, creating a rich, velvety coating that clings to the potato-filled pierogi and the savory sausage coins. This technique ensures that every bite is packed with flavor while keeping the pierogi from drying out in the oven heat.
Using a single baking dish simplifies the process and makes cleanup straightforward. By arranging the pierogi and kielbasa directly in the ceramic dish, you eliminate the need for extra pots or pans. The cheese topping creates a protective layer that keeps the interior moist, while the edges of the casserole develop a slight crust that adds a pleasant contrast in texture to the soft dumplings and tender sausage.

What you need

Ingredients

5 ingredients

Servings

Makes one 9x13 inch casserole.

24 count potato pierogi, store-bought or made ahead
1 lb kielbasa sausage, sliced into coins

Sauce

2 cups sour cream
1 tbsp onion powder

Topping

2 cups shredded cheddar cheese

Contains:

Gluten
Eggs
Milk

Tools

Equipment

9x13 inch ceramic baking dish
Mixing bowl
Whisk
Large serving spoon

Swaps

Substitutions

Instead ofPotato pierogi
UseUse cheese or sauerkraut pierogi for a different flavor profile.
Instead ofKielbasa
UseSmoked sausage or andouille can be substituted if kielbasa is unavailable.

Good to know

Notes

Select high-quality potato pierogi from the freezer section, as these hold their shape well during the baking process. When choosing kielbasa, look for a standard smoked variety to provide the best balance of salt and smoke. If you prefer a sharper taste, you can add a pinch of black pepper to the sour cream mixture, but the onion powder provides the essential base flavor profile required for the classic onion-cream combination.

A ceramic baking dish is ideal for this recipe because it retains heat effectively and promotes even cooking throughout the casserole. If you only have a metal pan, be aware that it may brown the edges more quickly, so you might need to reduce the oven temperature slightly or cover the dish with foil for the first twenty minutes of baking. Ensure the oven is fully preheated before placing the dish inside to achieve the perfect texture.

Prep

Before you start

Before you begin, ensure your oven is preheated to the correct temperature. Gather your baking dish and mixing bowl. If your pierogi are frozen, there is no need to thaw them beforehand; they can go directly from the freezer into the baking dish. Slice the kielbasa into consistent, coin-shaped pieces to ensure they cook evenly. Have your shredded cheese ready to go so you can top the casserole immediately after pouring the sauce. A clear workspace will make the assembly process much smoother.

Step by step

Method

3 steps

Phase 1

Assembly of the base

Step 1: Prepare the base
Preheat the oven to 375°F (190°C). In a large baking dish, arrange the pierogi and sliced kielbasa in an even layer, ensuring they are well distributed.
You’ll need: potato pierogi · kielbasa sausage
Look for: The dish is evenly filled with no large gaps.
Tip: Ensure the pierogi are not stacked too deeply to allow even cooking.

Checkpoint

The pierogi and kielbasa should be arranged in a single, even layer at the bottom of the baking dish. The dish should look full but not overstuffed, with the sausage coins tucked into the spaces between the pierogi. This ensures that every bite will have a good ratio of dumpling to meat, and that the heat will circulate evenly throughout the dish during the baking process.

Phase 2

Applying the sauce

Step 2: Add the sauce
In a medium mixing bowl, whisk together the sour cream and onion powder until smooth. Pour this mixture evenly over the pierogi and kielbasa in the baking dish.
You’ll need: sour cream · onion powder
Look for: The sauce is smooth and covers the ingredients.
Tip: Gently shake the dish to let the sauce settle between the pierogi.

Checkpoint

The sour cream mixture should be completely smooth and free of lumps before you pour it over the ingredients. Once poured, it should coat the pierogi and sausage evenly. You can gently tilt the dish to ensure the sauce flows into the gaps. The final layer of shredded cheddar should cover the surface of the casserole, creating a uniform blanket that will melt into a delicious, golden topping.

Phase 3

Final baking and browning

Step 3: Bake the casserole
Top the dish with the shredded cheddar cheese. Bake for 30 to 35 minutes until the sauce is bubbling and the cheese is melted and golden. Ensure the kielbasa reaches an internal temperature of 160°F (71°C). Let the dish rest for 5 minutes before serving.
You’ll need: shredded cheddar cheese
Internal temperature 160°F (71°C)
Look for: The edges are bubbling and the cheese is golden brown.
Tip: Use a thermometer to check the center of the largest sausage piece.

Checkpoint

At the end of the baking time, the entire surface of the casserole should be golden and bubbling. The aroma of roasted onion and melted cheese should be apparent. The kielbasa should be heated through to the center, and the cheese should be slightly crispy at the edges of the dish. The consistency of the sauce should be thick and creamy, ready for serving after a short rest.

Doneness

How to tell it’s done

The casserole is done when the sauce is bubbling vigorously around the edges and the cheese on top has melted into a golden-brown crust. The pierogi should be heated through and soft, and the kielbasa should be hot. Using a meat thermometer, ensure the kielbasa has reached an internal temperature of 160°F (71°C). Allow the casserole to rest for 5 minutes after removing it from the oven, as this helps the sauce thicken slightly and makes serving much easier.

Avoid these

Common mistakes

Avoid over-crowding the baking dish, which can prevent the sauce from reaching the bottom layers. If the pierogi are piled too high, they may not cook through correctly. Ensure the sour cream is evenly distributed over the top; if it is concentrated in one spot, the flavors will not be balanced across the dish. Finally, do not skip the 5-minute resting period, as the sauce will be very thin and hot immediately out of the oven, making it difficult to scoop.

Cook safely

Food safety

Safe internal temperatures

Cook to at least these temperatures, measured with an instant-read thermometer in the thickest part.

Minimum safe internal temperatures
Food	Minimum internal temperature
Ground meat	160°F (71°C)

Better results

Tips

Tip 1
For a more intense onion flavor, you can sauté a small amount of diced fresh onion in butter before stirring it into the sour cream. This adds a nice texture and depth to the sauce, though it does require an extra step on the stovetop. Ensure the onions are cooled slightly before mixing them with the sour cream to prevent the sauce from becoming too thin or splitting during the baking process.
Tip 2
If you find the cheese is browning too quickly before the casserole is heated through, loosely tent the dish with a piece of aluminum foil for the first half of the cooking time. Remove the foil for the final 10 minutes to allow the cheese to develop a beautiful golden color. This ensures the center of the casserole is perfectly hot without the topping becoming overly dark or burnt.

Make it yours

Variations

Spicy Kielbasa Version

Add a teaspoon of red pepper flakes or a tablespoon of hot sauce to the sour cream mixture before pouring it over the pierogi for a spicy kick that complements the savory sausage.

Vegetable Addition

Toss in two cups of fresh spinach or sautéed mushrooms along with the pierogi and kielbasa before adding the sauce to introduce more texture and earthy flavor to the casserole.

On the table

Serving suggestions

Serve this casserole directly from the baking dish for a casual family meal. It pairs beautifully with a simple side salad of crisp greens or some steamed green beans to balance the richness of the cream and cheese. A dollop of extra sour cream on the side can be a nice addition if you prefer a cooler contrast to the hot, savory pierogi and melted cheese.

Since this is a hearty, all-in-one meal, there is no need for heavy side dishes. A crusty piece of bread can be useful for mopping up any remaining sauce left on the plate. Because the dish is dense and satisfying, smaller portions are often sufficient, especially when served alongside a light vegetable side. Ensure everyone gets a good mix of pierogi, kielbasa, and the creamy sauce in their serving.

Leftovers

Storage & make-ahead

Fridge: Store in an airtight container for up to 3 days.
Freezer: Freezing is not recommended as the sour cream sauce may separate and the pierogi texture can become mushy.
Reheat: Reheat individual portions in the microwave until hot, or bake in a 350°F oven until warmed through.

If you have leftovers, allow the casserole to cool completely at room temperature for no more than 2 hours before transferring it to the refrigerator. Place the leftovers in an airtight container to keep them fresh. The creamy sauce can sometimes separate slightly when cooled, but this will resolve when the dish is reheated properly. Consume the leftovers within three days for the best quality and flavor.

Make ahead

You can assemble the casserole up to 24 hours in advance. Simply prepare the base with the pierogi and kielbasa, add the sauce, and top with the cheese. Cover the dish tightly with plastic wrap or foil and store it in the refrigerator. When you are ready to cook, remove the dish from the refrigerator and let it sit on the counter for 20 minutes to take the chill off before placing it in the preheated oven.

Questions

Frequently asked questions

Can the pierogi be cooked before adding them to the dish?

It is not necessary to boil the pierogi first. They will cook perfectly in the heat of the oven while absorbing the flavors of the sour cream sauce and the kielbasa as they bake together in the dish.

What is the best way to prevent the sauce from becoming too thin?

Ensure you are using full-fat sour cream, as lower-fat versions have a higher water content and are more likely to become runny during the baking process. The fat helps the sauce maintain a thick, creamy consistency.

Can this recipe be doubled for a larger crowd?

Yes, you can easily double the ingredients and bake the casserole in two separate 9x13 inch dishes. Do not attempt to stack the ingredients too deeply in one dish, as this will prevent the center from heating through properly.

Everything in one place: the recipe card below gathers the ingredients, steps and estimated nutrition, ready to print.

Recipe card