Cheesy potato and smoked sausage casserole brings together golden potato cubes, browned sausage, and a bubbling layer of cheddar and mozzarella. It is hearty enough to be dinner on its own, with crisp edges around the pan and soft, buttery potatoes underneath. A spoonful pulls away with just enough melted cheese to make everyone reach for a plate.
This version keeps the potatoes and sausage visible rather than burying them in a heavy sauce. A quick parboil gives the potatoes a head start, while browning the sausage builds flavor before everything goes into the oven. There is no canned soup to open and no separate cheese sauce to whisk.
Recipe at a glance
- Servings: 6 generous portions
- Prep time: 15 minutes
- Stovetop time: about 15 minutes, with some overlap
- Bake time: 25–30 minutes
- Rest time: 5 minutes
- Total time: about 1 hour
- Equipment: 9 × 13-inch baking dish, large pot, colander, skillet, and mixing bowl
Why you will love this casserole
The smoked sausage seasons the whole pan, so the ingredient list can stay simple. Cheddar brings a sharp, savory flavor, and mozzarella gives the topping its gentle stretch. Meanwhile, a little butter coats the potatoes without turning the casserole soupy.
Parboiling is the small extra step that makes the timing more dependable. Raw potato cubes can take much longer to soften than the cheese needs to melt. Giving them a short simmer first means the oven can finish the potatoes and brown the topping together.
Ingredients
- 2 1/2 pounds Yukon Gold potatoes, scrubbed and cut into even 3/4-inch cubes
- 14–16 ounces fully cooked smoked sausage or kielbasa, cut into 1/2-inch coins
- 1 medium yellow onion, diced
- 1 tablespoon olive oil
- 3 tablespoons unsalted butter, melted, plus a little for the baking dish
- 1 teaspoon garlic powder
- 1 teaspoon smoked paprika
- 1/2 teaspoon dried thyme
- 1/2 teaspoon freshly ground black pepper
- 1/4 teaspoon fine salt, plus salt for the potato water and more to taste
- 1 1/2 cups freshly shredded sharp cheddar, divided
- 1 cup shredded low-moisture mozzarella, divided
- 1 tablespoon chopped parsley or sliced green onion, optional
Choosing the potatoes, sausage, and cheese
Potatoes: Yukon Gold potatoes become creamy inside and hold their shape reasonably well. Their thin skins can stay on. Red potatoes also work. If using russets, peel them if preferred and handle the cooked cubes gently because their edges break down more easily.
Sausage: Read the package and choose a product labeled fully cooked. Smoked flavor alone does not mean a sausage is ready to eat. Beef, pork, or a blend works well here. Fully cooked turkey sausage is another option, though it may need a little extra oil in the skillet.
Cheese: Grate a block of cheddar if you can; it usually melts more smoothly than pre-shredded cheese. Low-moisture mozzarella gives a stretchy topping without adding the water that fresh mozzarella can release. Keep the cheese quantities moderate so the potatoes still have a chance to brown.
How to make cheesy potato and smoked sausage casserole
Step 1: Prepare the ingredients and baking dish
Heat the oven to 400°F (200°C) and lightly butter a 9 × 13-inch baking dish. Cut the potatoes into evenly sized 3/4-inch cubes, slice the sausage into coins, and dice the onion. Shred the cheeses and keep them in separate bowls so it is easy to reserve some for the top.
A sturdy disposable aluminum pan can be used, like the one in the featured photo. Set it on a rimmed baking sheet before filling so it is easier to lift safely.
Step 2: Parboil the potatoes
Put the potatoes in a large pot and cover with cold water by about an inch. Salt the water lightly, bring it to a boil, then reduce to a steady simmer. Cook for about 7–10 minutes after the water reaches a boil, until the outside yields to a fork but the center still offers a little resistance.
Drain thoroughly and leave the potatoes in the colander for 2–3 minutes so excess steam can escape. They should be barely tender, not falling apart. Dry surfaces take up the butter and seasoning better than wet ones.
Step 3: Brown the sausage and soften the onion
While the potatoes cook, heat the olive oil in a large skillet over medium-high heat. Add the fully cooked sausage in a single layer and brown for 4–6 minutes, turning once or twice. Work in batches if the pan is crowded.
Reduce the heat to medium, add the onion, and cook for another 3–4 minutes until softened. If there is a large amount of rendered fat, spoon off the excess, leaving enough to lightly coat the pan.
Step 4: Season and combine
In a large bowl, mix the melted butter, garlic powder, smoked paprika, thyme, pepper, and 1/4 teaspoon salt. Add the drained potatoes, sausage, and onion. Fold gently with a wide spatula so the potatoes are coated without being crushed.
Let the mixture cool for a minute or two, then fold in 1/2 cup cheddar and 1/2 cup mozzarella. Sausage and cheese can both be salty, so keep any extra salt modest.
Step 5: Assemble the casserole
Spread the mixture evenly in the prepared dish. Avoid pressing it down tightly; a little space between pieces helps the edges brown. Sprinkle the remaining 1 cup cheddar and 1/2 cup mozzarella over the top, allowing a few potatoes and sausage coins to peek through.
This is a chunky, cheesy casserole rather than a creamy potato bake. There is no need to pour broth or milk into the pan.
Step 6: Bake, rest, and serve
Bake uncovered for 25–30 minutes, until the potatoes are fully tender, the cheese is melted with golden patches, and the center is hot throughout. A food thermometer inserted into the center should read 165°F. If the cheese is browning before the potatoes soften, cover loosely with foil and continue baking.
For a little extra color, broil briefly only if your baking dish is rated for it, watching continuously. Rest for 5 minutes, add parsley or green onion if using, and serve while the cheese is still soft.
Tips for the best texture
- Cut the potatoes evenly. A mix of large chunks and tiny pieces will not cook at the same rate.
- Stop the simmer early. The potatoes finish in the oven, so they do not need to be completely soft before draining.
- Drain well. Water clinging to the potatoes creates steam and can leave a puddle in the pan.
- Brown the sausage first. The skillet gives it flavorful edges that are harder to achieve beneath the cheese.
- Use a wide, shallow dish. A deep, crowded pan holds moisture and takes longer to heat in the middle.
- Check tenderness before serving. Oven timing is a guide; a fork should slide easily into the largest potato cubes.
Easy variations
Add vegetables: Sauté a diced bell pepper with the onion. For broccoli, add about 1 1/2 cups small florets during the last 2 minutes of the potato simmer, then drain everything thoroughly. Keep additions modest so the pan does not become crowded.
Make it spicy: Use fully cooked andouille sausage, swap part of the cheddar for pepper Jack, or add a pinch of red pepper flakes. Taste your sausage first; some varieties are already quite hot.
Change the cheese: Monterey Jack or Colby Jack can replace the mozzarella. The casserole will still melt nicely, though the flavor and amount of stretch will vary.
For a gluten-free version: Check the sausage and seasoning labels. The basic potato, butter, and cheese mixture does not need flour, but packaged ingredients can differ.
What to serve with it
A crisp green salad, steamed green beans, or roasted broccoli balances the richness of the cheese and sausage. A sharp vinaigrette is especially good alongside the buttery potatoes. For another hearty potato dinner, try our slow cooker beef and potatoes.
Make-ahead instructions
You can grate the cheese, dice the onion, and slice the fully cooked sausage a day ahead, keeping everything refrigerated in covered containers. For the freshest texture, parboil the potatoes and assemble the casserole on the day you bake it.
If assembling ahead, cool the cooked components promptly in shallow containers, refrigerate, and combine them once chilled. Cover and refrigerate the assembled casserole for up to 24 hours. Bake from chilled in an oven-safe dish suitable for the temperature change, allowing extra time and checking that the center reaches 165°F. Add the topping cheese near the end if it begins to brown too quickly.
Storing and reheating leftovers
Refrigerate leftovers in shallow, covered containers within 2 hours of cooking, or within 1 hour when the surrounding temperature is above 90°F. Keep the refrigerator at 40°F or below and use within 3–4 days. For longer storage, freeze portions for up to 2–3 months for best quality; thaw in the refrigerator before reheating.
Reheat covered in a 350°F oven until the center reaches 165°F, then uncover briefly to refresh the top. Individual portions can be microwaved in short intervals, stirring or rotating as needed so they heat evenly. Potatoes may soften slightly after freezing, but the casserole is still useful for an easy lunch.
Frequently asked questions
Can I skip parboiling the potatoes?
Not with the timing in this recipe. Raw potato cubes need much longer in the oven, and the cheese can overbrown before they soften. The short simmer makes the final bake more predictable.
Can I use frozen diced potatoes?
Yes, but thaw and drain them well first. Frozen potato products vary: some are already partially cooked, while others need more time. Follow the package guidance and check tenderness rather than using the parboiling time automatically.
Can I use uncooked sausage?
This recipe is written for fully cooked smoked sausage. If substituting raw sausage, cook it completely according to its package directions before slicing and adding it. Do not rely on browning alone to judge whether raw sausage is cooked.
Why is my casserole watery?
The most common causes are wet potatoes, fresh mozzarella, or a crowded dish that traps steam. Drain the potatoes thoroughly, use low-moisture mozzarella, and bake uncovered in a wide dish.
Can I double the recipe?
Use two 9 × 13-inch dishes rather than piling everything into one pan. Rotate their positions if needed and check each dish for tender potatoes and a hot center.
Is there a cream sauce in this recipe?
No. Butter, a little cheese folded through the filling, and a melted cheese topping bring everything together. The finished casserole keeps its distinct potato cubes and sausage coins, like the dish in the featured photo.