Crockpot Pierogi Casserole with Kielbasa is the kind of dinner that makes a Tuesday feel like a Sunday. Frozen pierogies, smoky kielbasa, and a creamy cheese sauce go into the slow cooker, and three hours later you have bubbling, golden comfort food with almost no hands-on work.
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I built this recipe around a 6-quart slow cooker because that size gives the pierogies room to sit in a single layer without turning to mush. If you only have a 4-quart, cut the pierogies to 20 ounces and the broth to 1 cup so nothing overflows.
One thing I want you to know up front: this is not a dump-and-go recipe. You stir once at the 90-minute mark, and that single stir is the difference between creamy and gluey. It takes 30 seconds.
Why You'll Love This Recipe
About the Ingredients
2 pounds (907g) frozen pierogies, any filling (potato, cheddar, or sauerkraut)
Keep them frozen; thawed pierogies fall apart in the slow cooker. Mrs. T's classic cheddar is the most widely available, but any store brand works. If you only find fresh (refrigerated) pierogies, reduce the broth to 1 cup.
14 ounces (397g) smoked kielbasa, sliced into 1/2-inch coins
Look for kielbasa with a firm, slightly wrinkled casing and no pooling liquid in the package. Turkey kielbasa or smoked sausage are fine swaps, but add 1 tablespoon olive oil since they have less fat.
1 medium yellow onion, thinly sliced (about 1 1/2 cups)
Yellow onion gives the sweetest result after slow cooking. Sweet onion or a large shallot works too if that is what you have.
3 tablespoons unsalted butter
Salted butter works, but then skip the added salt until you taste at the end. For a dairy-free version, use a plant butter stick, not a tub spread.
1 can (10.5 ounces / 298g) condensed cream of mushroom soup
Cream of celery or cream of chicken are easy swaps. For a gluten-free version, use a GF condensed cream soup and check your kielbasa label.
1 cup (240ml) low-sodium chicken broth
Vegetable broth keeps it meatless-friendly if you swap the kielbasa for mushrooms. Water plus 1 teaspoon bouillon paste also works in a pinch.
1 cup (113g) shredded sharp cheddar cheese
Buy a block and shred it yourself; pre-shredded cheese is coated in starch and melts grainy. Monterey Jack or a cheddar-jack blend melts even more smoothly.
1/2 cup (120g) sour cream, full-fat
Full-fat is important here because low-fat sour cream curdles under long heat. Plain whole-milk Greek yogurt is a solid substitute.
1 teaspoon garlic powder, 1 teaspoon smoked paprika, 1/2 teaspoon black pepper
Smoked paprika is what gives this dish its cozy, campfire depth. Regular paprika works but the flavor will be flatter. Add 1/4 teaspoon cayenne if you like heat.
2 tablespoons chopped fresh chives or parsley, for garnish
Chives echo the onion flavor; parsley adds a fresh green bite. Dried chives work too, but use 1 tablespoon since they are stronger.
Tips & Tricks
Do not stir at the start
Layer the pierogies on the bottom, then pour the sauce over them. Stirring early breaks the wrappers before they firm up.
Watch your slow cooker size
A 6-quart crock keeps everything in one even layer. In a smaller pot, reduce the broth by 1/2 cup so the sauce does not turn soupy.
Add the sour cream last
Stir it in after the slow cooker is off. Boiling sour cream is the number one cause of a grainy, separated sauce.
Thicken while hot
If the sauce looks thin at the end, whisk 1 tablespoon cornstarch with 1 tablespoon cold water and stir it in with the lid on for 5 more minutes.
Pro Tips
Step-by-Step Instructions
1. Brown the kielbasa
Heat a large skillet over medium-high heat, about 375F (190C), and sear the kielbasa coins for 4 minutes total, turning once, until the edges are deep golden brown. This builds a smoky crust the slow cooker cannot create.
2. Soften the onions
Melt the butter in the same skillet over medium heat, about 325F (163C), and cook the onions for 6 minutes, stirring often, until translucent and lightly golden. Scrape up the browned kielbasa bits as they soften.
3. Build the sauce
Whisk the cream of mushroom soup, chicken broth, garlic powder, smoked paprika, and black pepper into the skillet with the onions. Simmer for 2 minutes at a gentle bubble, about 200F (93C), until the mixture is smooth and slightly thickened.
4. Layer the crock
Spray a 6-quart slow cooker with nonstick spray. Spread the frozen pierogies in an even layer on the bottom, scatter the browned kielbasa over them, then pour the sauce evenly over everything.
5. Slow cook
Cover and cook on LOW for 3 hours. Do not lift the lid for the first 90 minutes; every peek releases heat and adds cooking time.
6. Stir once
At the 90-minute mark, stir gently from the bottom with a silicone spatula, then re-cover. The sauce should look creamy and the pierogies should feel tender but still hold their shape.
7. Finish with cheese
Sprinkle the shredded cheddar over the top, cover, and cook 15 more minutes on LOW until the cheese is fully melted and the edges bubble, about 165F (74C) in the center.
8. Add sour cream and serve
Turn off the slow cooker, stir in the sour cream, and let it sit uncovered for 10 minutes. The sauce will thicken to a glossy gravy. Garnish with chives and serve hot.
Delicious Variations
Bacon Cheddar Swap
Replace the kielbasa with 12 ounces cooked crumbled bacon and use smoked gouda instead of cheddar for a deeper, smokier plate.
Sauerkraut Kick
Add 1 cup drained sauerkraut between the pierogies and kielbasa. The tang cuts the creaminess and tastes like a Polish deli platter.
Mushroom Vegetarian
Skip the kielbasa, add 16 ounces sliced cremini mushrooms with the onions, and use vegetable broth. Add 1 teaspoon soy sauce for that missing savory depth.
How to Store Crockpot Pierogi Casserole with Kielbasa – That Oven Feelin
Refrigerator
Cool within 2 hours, then store in an airtight container for up to 4 days. The pierogies soften each day, so day one is best.
Freezer
Freeze in a freezer-safe container for up to 2 months. Freeze before adding the sour cream, since dairy sauces separate when thawed.
Reheating
Reheat in a covered skillet over medium-low heat, about 300F (149C), for 8 minutes with a splash of broth. The microwave works but makes the pierogies rubbery.
Frequently Asked Questions
Q: Can I use frozen pierogies straight from the freezer in a crockpot?
Yes, always start with frozen pierogies. Thawed ones absorb too much liquid and turn mushy within an hour of cooking. Add them straight from the freezer bag with no rinsing.
Q: How long do you cook pierogi casserole in a slow cooker?
Cook on LOW for 3 hours total, stirring once at the 90-minute mark, then 15 minutes more with the cheese on top. High heat for 1 1/2 hours also works but gives a less creamy sauce.
Q: Why did my pierogi casserole turn out mushy?
Mushy pierogies usually mean too much liquid or too much stirring. Use exactly 1 cup of broth, stir only once, and keep the lid on so steam does not collect and drip back in.
Q: Can I make this crockpot pierogi casserole ahead of time?
Yes, assemble everything except the cheese and sour cream up to 24 hours ahead and refrigerate in the crock insert. Add 30 minutes to the cook time since it starts cold.
Q: What do you serve with crockpot pierogi casserole?
A crisp green salad or steamed green beans balance the richness best. Crusty bread is great for sopping up the sauce, and a dollop of extra sour cream on top never hurts.
Grab your slow cooker, a bag of frozen pierogies, and a pound of kielbasa this week. Layer it, walk away, and stir once. That is the whole job. Small steps, big change.
Crockpot Pierogi Casserole with Kielbasa – That Oven Feelin
Crockpot Pierogi Casserole with Kielbasa delivers creamy, cheesy comfort with zero oven time, and the slow cooker does almost all the work for you.
🧂 Ingredients
- 2 pounds (907g) frozen pierogies, any filling (potato, cheddar, or sauerkraut)
- 14 ounces (397g) smoked kielbasa, sliced into 1/2-inch coins
- 1 medium yellow onion, thinly sliced (about 1 1/2 cups)
- 3 tablespoons unsalted butter
- 1 can (10.5 ounces / 298g) condensed cream of mushroom soup
- 1 cup (240ml) low-sodium chicken broth
- 1 cup (113g) shredded sharp cheddar cheese
- 1/2 cup (120g) sour cream, full-fat
- 1 teaspoon garlic powder, 1 teaspoon smoked paprika, 1/2 teaspoon black pepper
- 2 tablespoons chopped fresh chives or parsley, for garnish
📋 Instructions
- 1Brown the kielbasa — Heat a large skillet over medium-high heat, about 375F (190C), and sear the kielbasa coins for 4 minutes total, turning once, until the edges are deep golden brown. This builds a smoky crust the slow cooker cannot create.
- 2Soften the onions — Melt the butter in the same skillet over medium heat, about 325F (163C), and cook the onions for 6 minutes, stirring often, until translucent and lightly golden. Scrape up the browned kielbasa bits as they soften.
- 3Build the sauce — Whisk the cream of mushroom soup, chicken broth, garlic powder, smoked paprika, and black pepper into the skillet with the onions. Simmer for 2 minutes at a gentle bubble, about 200F (93C), until the mixture is smooth and slightly thickened.
- 4Layer the crock — Spray a 6-quart slow cooker with nonstick spray. Spread the frozen pierogies in an even layer on the bottom, scatter the browned kielbasa over them, then pour the sauce evenly over everything.
- 5Slow cook — Cover and cook on LOW for 3 hours. Do not lift the lid for the first 90 minutes; every peek releases heat and adds cooking time.
- 6Stir once — At the 90-minute mark, stir gently from the bottom with a silicone spatula, then re-cover. The sauce should look creamy and the pierogies should feel tender but still hold their shape.
- 7Finish with cheese — Sprinkle the shredded cheddar over the top, cover, and cook 15 more minutes on LOW until the cheese is fully melted and the edges bubble, about 165F (74C) in the center.
- 8Add sour cream and serve — Turn off the slow cooker, stir in the sour cream, and let it sit uncovered for 10 minutes. The sauce will thicken to a glossy gravy. Garnish with chives and serve hot.
