My Pierogi, Cabbage & Kielbasa Casserole with Cheddar Cheese might just be the most Polish casserole ever. It’s loaded with tender pierogies, buttery cabbage, smoky kielbasa, and a creamy cheddar sauce for the ultimate comfort food dinner.
Preheat oven to 350 degrees F. Lightly spray a 9x13-inch baking dish with nonstick spray. Let the boxes of mini pierogies sit at room temperature while you prepare the casserole so they can thaw slightly.
In a large skillet, melt butter over medium heat. Add cabbage and onion and cook, stirring occasionally, until softened and lightly golden, about 10-15 minutes.
Stir in garlic, salt, paprika, and thyme and cook for 1 minute until everything smells really good.
In a small bowl whisk together milk, chicken broth, flour, onion powder and black pepper until smooth. Pour the gravy mixture into the skillet with the cabbage. Stir and cook for a few minutes until slightly thickened and creamy. Stir in 1 cup of the shredded cheddar cheese until melted into the sauce.
Pour cabbage mixture into the baking dish. Gently fold in pierogies and kielbasa until everything is evenly coated.
Cover with foil and bake for 25 minutes.
Remove foil, sprinkle remaining cheddar cheese over the top, and bake uncovered for 10 more minutes, until melted and bubbly.
Let rest for a few minutes before serving. Enjoy dinner!