Baked Pierogi & Kielbasa Casserole

When comfort food is the goal, few dishes satisfy like a warm Baked Pierogi & Kielbasa Casserole. This hearty meal combines tender potato-filled pierogi, smoky kielbasa sausage, creamy cheese sauce, and perfectly baked onions into one rich and flavorful casserole. It is the kind of dish that fills the kitchen with an irresistible aroma and brings everyone to the table hungry.

Perfect for busy weeknights, family gatherings, or cold evenings, this casserole transforms simple ingredients into a filling meal with very little effort. The combination of buttery pierogi and savory sausage creates a balance of textures and flavors that feels both rustic and comforting.

Why You’ll Love This Recipe

This casserole is popular because it is:

• Easy to prepare with minimal cooking steps
• Rich, creamy, and incredibly satisfying
• Perfect for feeding a crowd
• Great for meal prep and leftovers
• Customizable with different cheeses or vegetables

The dish comes together quickly and bakes beautifully in the oven, allowing the flavors to blend into a creamy, cheesy casserole with golden edges.

Ingredients

Main Ingredients

• 1 package frozen potato and cheese pierogi
• 14 ounces kielbasa sausage, sliced into rounds
• 1 medium onion, thinly sliced
• 2 cups shredded cheddar cheese
• 1 cup mozzarella cheese
• 1 can cream of mushroom soup
• 1 cup sour cream
• ½ cup milk
• 2 tablespoons butter
• Salt and black pepper to taste
• Chopped parsley for garnish

Optional Add-Ins

You can customize the casserole with:

• Crispy bacon pieces
• Sautéed mushrooms
• Spinach
• Jalapeños for heat
• Caramelized onions
• Extra smoked cheese

Step-by-Step Method

Step 1: Prepare the Oven and Baking Dish

Preheat your oven to 375°F (190°C).

Lightly grease a large casserole dish with butter or cooking spray. This prevents sticking and helps the casserole bake evenly.

Step 2: Cook the Onions

Place a skillet over medium heat and melt the butter.

Add the sliced onions and cook slowly for about 8–10 minutes until soft and lightly golden. Stir occasionally to prevent burning. Properly cooked onions add sweetness and depth to the casserole.

Remove the onions from the heat and set aside.

Step 3: Brown the Kielbasa

Using the same skillet, add the sliced kielbasa sausage.

Cook for 4–5 minutes until the edges begin to brown slightly. Browning enhances the smoky flavor and gives the sausage a richer taste.

Once cooked, remove from heat.

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