Easy Kielbasa Sausage Cheesy Potato Casserole

This casserole starts with pre-cooked kielbasa — no boiling or parboiling needed.

You’ll slice the potatoes thin (about 1/8 inch), so they soften fully while baking without turning mushy.

The cheese melts into creamy ribbons, not pools or greasy spots — that’s from using full-fat dairy and letting it rest five minutes before serving.

About the Ingredients

1 lb (450g) smoked kielbasa sausage, sliced 1/4-inch thick

Look for fully cooked kielbasa in the deli or refrigerated meat section. If you only find raw kielbasa, pan-fry it first until browned and internal temp hits 160°F (71°C). Andouille or smoked turkey sausage work fine too.

1.5 lbs (680g) Yukon Gold potatoes, peeled and sliced 1/8-inch thick

Yukon Golds hold up better than russets here — they’re creamy but don’t disintegrate. A mandoline helps get even slices; if yours vary, tuck thicker ones toward the center of the dish.

1 cup (240ml) full-fat sour cream

Low-fat or Greek yogurt will make the casserole dry and grainy. Sour cream adds tang and keeps the layers moist. Stir it well before mixing in.

1 cup (115g) shredded sharp cheddar cheese

Pre-shredded cheese has anti-caking starch that hinders melt. Grate your own from a block — it browns evenly and pulls into strings.

1 cup (115g) shredded mozzarella cheese

Mozzarella gives stretch and mild richness. Fresh low-moisture mozzarella works — skip the wet, fresh kind sold in water.

1/2 cup (50g) grated Parmesan cheese

Parmesan adds salt and depth. Use real Parmigiano-Reggiano, not the green can — it browns faster and tastes sharper.

1 medium yellow onion, thinly sliced

Yellow onions soften and sweeten without overpowering. Red onions are too sharp here; white onions work if that’s all you have.

2 tbsp (30ml) unsalted butter, melted

Butter coats the potato slices and helps them crisp at the edges. Margarine makes the top greasy; olive oil lacks browning power.

1 tsp (5g) kosher salt

Kielbasa is already salty, so we use less salt than most potato casseroles. Taste the sour cream mixture before adding more — you may skip it entirely.

1/2 tsp (1g) black pepper, freshly ground

Tips & Tricks

• Don’t skip rinsing the potato slices in cold water — it washes off excess starch and prevents gummy layers.
• If your kielbasa is very fatty, blot slices with paper towel before layering — too much grease makes the cheese slide off.
• Layer potatoes tightly with no gaps — loose packing lets steam escape and leaves dry patches.
• Let the casserole sit 5 minutes after baking — it firms up just enough to slice cleanly without oozing.

Step-by-Step Instructions

1. Prep potatoes and onion

Peel and slice potatoes 1/8 inch thick. Rinse in cold water until water runs clear, then drain well in a colander. Thinly slice onion — no need to chop.

2. Mix filling

In a large bowl, stir together sour cream, cheddar, mozzarella, Parmesan, melted butter, salt, and pepper. Add potatoes and onion. Toss gently until every slice is coated — don’t mash.

3. Add kielbasa

Fold in kielbasa slices just until distributed. Overmixing breaks the potatoes. Let the mixture sit 5 minutes — the sour cream soaks in and helps bind layers.

4. Layer in dish

Spread mixture into a greased 9×13-inch metal baking dish. Press down lightly with a spatula to level — no air pockets between layers.

5. Bake at 375°F

Bake uncovered at 375°F (190°C) for 35 minutes. Edges should bubble steadily and top should look dry, not wet. A knife inserted in center meets light resistance — potatoes are tender but not falling apart.

6. Rest before serving

Let stand 5 minutes. The casserole tightens up, making clean slices possible. Serve warm — not piping hot — so cheese stays gooey, not stringy.

Delicious Variations

• Add 1/2 cup frozen peas and 1/4 cup diced red bell pepper with the potatoes — they cook through without turning soggy.
• Swap half the cheddar for Gruyère and add 1/4 tsp caraway seeds to the sour cream mix — it nods to Eastern European roots.
• Top with crushed rye crackers or pumpernickel toast points instead of Parmesan for extra crunch and earthy flavor.

How to Store Kielbasa Sausage Cheesy Potato Casserole

Frequently Asked Questions

This casserole doesn’t ask for fancy tools or rare ingredients — just a sharp knife, a bowl, and 50 minutes of your time. It fills the kitchen with that warm, smoky-cheesy smell that says ‘dinner’s ready’ before you even pull it from the oven.

Easy Kielbasa Sausage Cheesy Potato Casserole

Kielbasa Sausage Cheesy Potato Casserole is a no-fuss, one-dish dinner with smoky sausage, tender potatoes, and three cheeses baked until golden and bubbling.

15 minPrep time35 minCook time6Servings285 kcalCalories

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🧂 Ingredients

• 1 lb (450g) smoked kielbasa sausage, sliced 1/4-inch thick
• 1.5 lbs (680g) Yukon Gold potatoes, peeled and sliced 1/8-inch thick
• 1 cup (240ml) full-fat sour cream
• 1 cup (115g) shredded sharp cheddar cheese
• 1 cup (115g) shredded mozzarella cheese
• 1/2 cup (50g) grated Parmesan cheese
• 1 medium yellow onion, thinly sliced
• 2 tbsp (30ml) unsalted butter, melted
• 1 tsp (5g) kosher salt
• 1/2 tsp (1g) black pepper, freshly ground

📋 Instructions

1. 1Prep potatoes and onion — Peel and slice potatoes 1/8 inch thick. Rinse in cold water until water runs clear, then drain well in a colander. Thinly slice onion — no need to chop.
2. 2Mix filling — In a large bowl, stir together sour cream, cheddar, mozzarella, Parmesan, melted butter, salt, and pepper. Add potatoes and onion. Toss gently until every slice is coated — don’t mash.
3. 3Add kielbasa — Fold in kielbasa slices just until distributed. Overmixing breaks the potatoes. Let the mixture sit 5 minutes — the sour cream soaks in and helps bind layers.
4. 4Layer in dish — Spread mixture into a greased 9×13-inch metal baking dish. Press down lightly with a spatula to level — no air pockets between layers.
5. 5Bake at 375°F — Bake uncovered at 375°F (190°C) for 35 minutes. Edges should bubble steadily and top should look dry, not wet. A knife inserted in center meets light resistance — potatoes are tender but not falling apart.
6. 6Rest before serving — Let stand 5 minutes. The casserole tightens up, making clean slices possible. Serve warm — not piping hot — so cheese stays gooey, not stringy.

👨🍳 Chef's Note: I like to serve this with a simple green salad dressed in lemon juice and olive oil — the brightness cuts through the richness without competing.

Servings: 6

Cuisine: American

Course: Main Dish

RecipesCooker15 minutes35 minutes55 minutes

Nutrition (per serving): 285 kcal · 12g protein · 22g carbs · 9g fat