Name: Pierogi Casserole
Prep time: 5 min
Cook time: 40 min
Total time: 45 min
Ingredients: 2 pounds frozen cheddar pierogies; 1 (16-ounce) jar alfredo sauce; 14 ounces kielbasa sausage, (sliced); 1/4 cup green onions, (sliced); 1 cup mozzarella, (shredded); 1 cup cheddar, (shredded)

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This Pierogi Casserole has become a huge family favorite! Layers of tender, cheesy pierogi are baked with creamy Alfredo sauce, smoky kielbasa sausage, sliced green onions, and gooey melted cheese. It’s cozy, satisfying, and comes together in minutes — a true weeknight hero.

This recipe uses store-bought shortcuts (frozen pierogies and jarred Alfredo sauce!) but tastes homemade. Every bite delivers creamy, cheesy comfort with just the right hint of smoky sausage — the kind of flavor that earns “make this again!” requests all week long.

If you love easy, family-style comfort food like my Johnny Marzetti Casserole or Hamburger Casserole, you’re going to flip for this Pierogi Casserole. It’s every bit as creamy and satisfying as Creamy Chicken Potato Casserole or Chicken and Dumpling Casserole, but with a fun twist — cheesy pierogies layered with smoky kielbasa and Alfredo sauce.

So grab your casserole dish — this one’s bound to become a regular at your dinner table. 💗

Do You Have To Boil Pierogies Before Baking?

Nope! That’s one of the best parts of this recipe — there’s no need to thaw or boil the pierogies before baking. Just layer them straight from the freezer into your casserole dish, add your sauce, cheese, and sausage, and let the oven do all the work. They bake up tender and perfectly cooked every time.

✨ Before You Begin

✨ No boiling required: You can use frozen pierogies straight from the bag — no need to thaw or boil!
✨ Add flavor with browning: If you have a few extra minutes, brown the kielbasa slices in a skillet before layering. It deepens the flavor beautifully.
✨ Choose a good Alfredo sauce: A quality sauce makes a big difference — look for one made with real cream, butter, and Parmesan.
✨ Use two cheeses: Mozzarella gives you that stretchy pull, while cheddar adds sharpness and depth.
✨ Spray your foil: Always spray one side of your foil with nonstick spray so the cheese doesn’t stick while baking.

🧀 Ingredients for Pierogi Casserole

This is just a quick glance at what you’ll need. For exact measurements and the full ingredient list, head down to the recipe card below.

Frozen cheddar pierogies: The star of the show — they bake up tender and pillowy.
Alfredo sauce: Adds creamy richness. You can use homemade or your favorite jarred brand.
Kielbasa sausage: Smoked Polish sausage adds saltiness and flavor depth.
Green onions: Fresh, mild bite that balances the richness.
Cheese blend: A mix of mozzarella and cheddar gives you both melt and flavor.

Pro Tips

⭐ Use a mix of cheeses for texture. Mozzarella gives you stretch; cheddar adds punch. You can also toss in a little Parmesan for extra savoriness.

⭐ Want more veggies? Stir in a handful of baby spinach or frozen peas between layers for color and freshness.

⭐ Add a crispy topping. For a little crunch, sprinkle buttered breadcrumbs or crushed Ritz crackers over the top during the last 10 minutes of baking.

⭐ Make it ahead. Assemble the casserole earlier in the day, refrigerate, then bake an extra 10–15 minutes to heat through.

How to Make Pierogi Casserole

Spread half the frozen pierogies in a single layer in a prepared baking dish.
Spoon half of the alfredo sauce over the pierogies.
Spread half the kielbasa over the pierogies and sauce.
Sprinkle half the green onions over the sausage.
Sprinkle half the cheese over the onions.
Repeat one more layer of each.
Cover with prepared foil and bake in a preheated oven for 20 minutes.
Remove foil and continue to bake until heated through and bubbly, about 20-25 minutes.

***See the full instructions below.

Frequently Asked Questions

Do you have to boil pierogies before baking?

Nope! You can bake them straight from frozen — no boiling, no thawing, no fuss.

Can I use a different sauce?

Yes! Swap Alfredo for a creamy cheese sauce, or even use a mix of cream of mushroom soup and sour cream for a twist.

How do I make it vegetarian?

Skip the sausage and add sautéed mushrooms or caramelized onions instead.

Can I freeze Pierogi Casserole?

Absolutely. Assemble, wrap tightly, and freeze before baking. When ready, bake from frozen (covered) at 350°F for about 45–50 minutes, removing the foil for the last 10–15 minutes.

What to Serve With

Fresh + Crisp Sides: Try my copycat KFC Coleslaw or House Salad to balance the rich, creamy casserole.

Cozy Breads: A basket of 7 Up Biscuits or Garlic Bread is perfect for soaking up every bit of sauce.

Sweet Finishes: Round out the meal with a comforting dessert like Bisquick Blueberry Cobbler, Fudge Pie, or Sugar Cream Pie.

Storing + Reheating + Make-Ahead Tips

Storing

Keep leftovers in an airtight container in the refrigerator for up to 3 days.

Reheating

Cover with foil and reheat in a 350°F oven for 15–20 minutes, or microwave individual portions until heated through.

Freezing

You can freeze the baked casserole or assemble it ahead and freeze before baking. Wrap tightly in foil and plastic wrap to prevent freezer burn.

Make-Ahead

Assemble up to a day ahead, cover tightly, and refrigerate. Bake as directed, adding about 10 extra minutes to account for the chilled ingredients.

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Thanks for stopping by my kitchen today — happy cooking, friends! ❤️ Kathleen

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