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Crockpot Pierogi Casserole with Kielbasa

Crockpot pierogi casserole with kielbasa layers frozen potato-and-cheese pierogi with smoky sausage, deeply golden onions, and a creamy cheese sauce that bubbles on the edges. A slow cooker method turns everything tender and cohesive—no pinching pierogi required.
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Prep Time 20 minutes
Cook Time 5 hours
rest 10 minutes
Total Time 5 hours 30 minutes
Servings: 6 servings
Course: Dinner
Cuisine: Eastern European
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

Casserole
  • 1 (16 oz) package frozen potato and cheese pierogi
  • 1 lb kielbasa sausage sliced into 1/4-inch coins
  • 1 yellow onion large, thinly sliced
  • 2 tbsp butter
  • 1 (10.5 oz) can condensed cream of chicken soup
  • 0.5 cup sour cream
  • 0.5 cup chicken broth
  • 1 tsp garlic powder
  • 0.5 tsp black pepper
  • 2 cup shredded cheddar cheese divided
  • 2 tbsp fresh chives chopped, for garnish

Equipment

  • 1 cast iron skillet
  • 1 Dutch oven

Method
 

Caramelize the onions
  1. Melt butter in a cast iron skillet over medium heat. Add the sliced onion and cook, stirring occasionally, for 12–15 minutes until deeply golden and softened (visual cue: onions look caramel-brown and very soft).
  2. Keep the onions warm in the skillet by letting them rest on one side while you prepare the kielbasa. This helps the next step brown the sausage without burning the onions.
Sear the kielbasa
  1. Push the onions to the side in the skillet and add the kielbasa coins. Cook for 3–4 minutes until lightly browned on the edges (visual cue: sausage surfaces show golden-brown spots).
Make the sauce
  1. In a bowl, whisk together cream of chicken soup, sour cream, chicken broth, garlic powder, and black pepper until smooth (visual cue: no streaks, uniform pale creamy sauce).
Layer the crockpot
  1. Grease the slow cooker insert. Add half the frozen pierogi in an even layer, then top with half the kielbasa-onion mixture, half the sauce, and 1 cup shredded cheddar.
  2. Repeat the layers with the remaining frozen pierogi, remaining kielbasa-onion mixture, remaining sauce, and the remaining cheddar. Spread everything out so it cooks evenly.
Slow cook
  1. Cover and cook on LOW for 4–5 hours, or until the pierogi are tender and the casserole is bubbling around the edges (visual cue: bubbling thickens near the rim and pierogi look swollen and cooked through).
Rest and serve
  1. Turn off the crockpot and let the casserole sit for 10 minutes to set slightly (visual cue: it thickens and holds together when you spoon it).
  2. Garnish with fresh chives and serve warm straight from the slow cooker.

Notes

Pro tip: caramelize the onions until truly deep golden—this adds sweet, savory depth that shows up even after slow cooking. Refrigerate leftovers in a covered container for up to 3–4 days; reheat in the microwave or in a covered pan until hot. Freezing is not recommended due to the creamy sauce texture. For a lighter option, swap in reduced-fat cheddar and use low-fat sour cream if desired.