Preheat oven: Set to 350°F (175°C). Grease a 9×13-inch baking dish.
Cook kielbasa & veggies:
In a skillet, melt butter or heat oil.
Sauté onions until soft, about 3–4 minutes.
Add kielbasa slices and garlic, cooking until lightly browned.
Mix sauce:
In a large bowl, stir together cream of mushroom soup, sour cream, milk, pepper, and paprika.
Add cooked pasta (or potatoes), kielbasa mixture, and 1 cup cheese. Mix until combined.
Assemble casserole:
Pour mixture into prepared baking dish.
Sprinkle with extra cheese and breadcrumbs (if using).
Bake:
Bake uncovered for 25–30 minutes, until hot and bubbly with a golden top.
Serve:
Garnish with parsley and serve hot.
Tips:
Swap cheddar for smoked gouda or mozzarella for different flavors.
Add peas, bell peppers, or sauerkraut for a Polish twist.
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