Easy Dump-and-Bake Kielbasa Pierogi Casserole with No Pre-Cooking

Easy Dump-and-Bake Kielbasa Pierogi Dinner

Frozen pierogi and fully cooked kielbasa make a hearty casserole with little work at the stove. Slice the sausage and onion, stir together a creamy sauce, and put everything in one baking dish. There’s no need to boil the pierogi or brown the kielbasa first.

The covered baking time lets the frozen pierogi heat through and soften in the sauce. A short uncovered bake melts the cheddar on top and lets some of the extra moisture evaporate. You’ll still need a cutting board and a bowl for the sauce, but there’s only one pan to cook and wash.

Ingredients and timing

Yield: About 6 servings
Prep time: 15 minutes
Bake time: 50 to 60 minutes
Total time: About 1 hour 10 minutes

For the casserole

• 2 pounds (about 900 g) frozen potato-and-cheese pierogi
• 12 to 14 ounces (340 to 400 g) fully cooked kielbasa, sliced into ¼-inch (6 mm) rounds
• 1 medium yellow onion, thinly sliced
• 1 can (10½ ounces/298 g) condensed cream of mushroom soup
• ¾ cup (180 ml) milk
• ½ cup (120 g) sour cream
• 1 teaspoon Dijon mustard
• ½ teaspoon freshly ground black pepper
• 1½ cups (about 170 g) shredded sharp cheddar, divided
• Chopped parsley or sliced scallions, for serving, optional

Use a 9-by-13-inch (23-by-33-cm) baking dish, a mixing bowl, and foil. A deep baking dish makes it easier to stir the casserole without spilling sauce over the sides.

Check the kielbasa package before you start. This recipe calls for fully cooked sausage. Fresh, uncooked sausage needs to be cooked separately to a safe internal temperature before it goes into the casserole. The covered bake described here is intended to heat cooked kielbasa, not cook raw sausage.

Condensed soup gives the sauce enough body to coat the pierogi without a stovetop roux. Cream of chicken soup also works if you prefer it. The sour cream adds tang, while the milk loosens the sauce so it can reach the pierogi as they bake. Sharp cheddar brings plenty of flavor, so taste the finished casserole before adding salt. Kielbasa, soup, and cheese can all be salty.

How to make the casserole

1. Heat the oven and prepare the dish. Set the oven to 375°F (190°C). Lightly grease the baking dish.

2. Mix the sauce. In a bowl, whisk the condensed soup, milk, sour cream, Dijon mustard, and black pepper until mostly smooth. Stir in ½ cup (about 55 g) of the cheddar.

3. Fill the dish. Spread the frozen pierogi in the baking dish. Scatter the sliced kielbasa and onion over and between them. Pour the sauce evenly across the top. Gently turn a few pierogi with a spoon or spatula so the sauce reaches the bottom of the dish. The pierogi do not need to be completely submerged.

4. Cover and bake. Cover the dish tightly with foil and bake for 40 minutes. Carefully remove the foil, watching for steam. Stir gently, bringing some sauce up from the bottom and turning any pierogi that still look dry. Check a pierogi near the center: it should be hot and tender, not cool or firm in the middle. If it needs more time, cover the dish again and bake for another 10 minutes before checking.

5. Add the cheese. Sprinkle the remaining 1 cup (about 115 g) cheddar over the casserole. Bake uncovered for 10 to 15 minutes, until the cheese is melted and the sauce bubbles around the edges. Let the dish stand for 5 to 10 minutes before serving. Add parsley or scallions if you like.

The resting time gives the sauce a chance to thicken slightly. It will still be creamy enough to spoon over the pierogi. If the casserole looks especially loose when it comes out of the oven, give it the full 10 minutes before serving.

Getting the texture right

Frozen pierogi vary in size and thickness, so the center of the dish is a better guide than the clock alone. A pierogi at the edge may be ready while one tucked beneath sausage in the middle is still cool. Check the center before adding the final layer of cheese; once the top is covered, it’s harder to see what needs more time.

Keep the foil snug during the first part of baking. The trapped steam helps heat the frozen pierogi and soften the onion. If the foil is loose, the exposed edges may dry out before the middle is hot. After you uncover the dish, the sauce should be bubbling at the edges by the time the cheese has melted.

The onion is sliced thin so it can soften during the covered bake. Thick wedges will retain more bite. For a milder onion flavor, use a sweet onion; yellow onion gives the casserole a stronger savory note. Either can go into the dish raw.

There’s no need to thaw the pierogi. Thawing can make them stick together and tear as you arrange them. Put them in the dish straight from the freezer, separating any that are loosely attached. If they’re frozen into a solid block, follow the package directions for separating them rather than forcing them apart with a knife.

Simple changes that still keep prep low

Potato-and-cheese pierogi are an easy match for kielbasa and cheddar, but other savory frozen pierogi can work. Check the package size when shopping: brands sell different counts and weights, and a much smaller bag will leave the casserole heavy on sauce and sausage. Aim for about 2 pounds total.

For a little more vegetable matter in the dish, scatter a few handfuls of shredded cabbage over the pierogi before adding the sauce. Slice it thinly so it softens in the covered bake. A small amount of drained sauerkraut is another option if you like its sharp flavor with kielbasa. Because sauerkraut adds salt and acidity, start with a modest layer and skip any extra salt.

You can also use smoked turkey kielbasa, provided it is fully cooked. It may taste less rich than pork kielbasa, but the baking method is the same. If you use a particularly spicy sausage, the mustard and sharp cheddar will still fit; there’s no need to change the sauce.

A bag of pre-shredded cheddar saves a few minutes. It may melt a little less smoothly than cheese shredded from a block, though it works well as a topping. Keep the cheese for the final uncovered bake rather than adding it all at the start. That way, you get a melted top without baking it under foil for most of the cooking time.

Serving and storing leftovers

This casserole is substantial on its own. A crisp green salad, sliced cucumbers, or steamed green beans make useful sides if you want something fresh alongside the creamy sauce. A spoonful of mustard at the table also suits the kielbasa.

Refrigerate leftovers in a covered container within two hours of cooking and use them within three to four days. Reheat individual portions in the microwave until hot throughout, or cover a baking dish and warm the leftovers in a 350°F (175°C) oven. Add a small splash of milk if the sauce has thickened in the refrigerator. Reheat leftovers to 165°F (74°C).

For a busy evening, the main advantage is straightforward: the pierogi go in frozen, the fully cooked kielbasa goes in without browning, and the sauce comes together in a bowl. Cover the dish long enough for the center to heat through, then uncover it for the cheddar topping. That small check before the final bake is what makes this low-prep dinner dependable.