Cheesy Smashed Potato Bake is my kind of potato casserole: crispy edges, soft centers, and a creamy cheese sauce that coats every crack and crinkle. It’s rich in the way scalloped potatoes are, but with more texture.
The combo of sharp cheddar, mozzarella, and Parmesan gives you that real cheesy pull plus a golden, bubbly top. I also like that the sauce has sour cream in it, so it tastes a little tangy and not flat.
For me, this is a holiday side dish I’ll happily make again on a random Sunday. It’s especially good next to roast chicken, ham, or anything coming off the grill.
Why You’ll Love This Recipe
Crispy + creamy: You get those smashed-potato crunchy bits, but they’re baked into a creamy sauce so it still feels like comfort food.
No fussy slicing: Baby potatoes keep this simple. No mandoline, no trying to get perfectly even slices.
Cheese that tastes like cheese: Sharp cheddar carries the flavor, mozzarella adds stretch, and Parmesan gives the top that toasty finish.
Easy to scale: This fits a 9×13 nicely, but it’s also easy to cut in half for a smaller dinner or double for a bigger group.
Flexible add-ins: Bacon, ham, different cheeses, extra herbs—this recipe is forgiving and still comes out reliably good.
Ingredients You’ll Need
Potatoes
- Baby Yukon gold potatoes: These smash really nicely and stay creamy in the middle. I like the thin skins here because they help the edges crisp up.
- Kosher salt: Salt the boiling water well so the potatoes taste seasoned all the way through, not just on top.
Creamy Cheese Sauce
- Unsalted butter: This starts the sauce and keeps it rich. If you only have salted butter, just go a little lighter on the added salt later.
- All-purpose flour: Regular flour is perfect here. It thickens the sauce so it clings to the smashed potatoes instead of running to the bottom.
- Whole milk: Whole milk makes the sauce feel smooth and full. Lower-fat milk works, but it won’t be quite as plush.
- Sour cream: This is the tangy, creamy part that makes the sauce taste like more than just “milk and cheese.” Greek yogurt works too if you want it a little lighter.
- Garlic powder: I prefer garlic powder here because it blends right into the sauce without little bits of garlic.
- Onion powder: Adds that mellow onion flavor without making the sauce taste sharp or chunky.
- Kosher salt: Season the sauce enough so it tastes good on its own. The potatoes soak up a lot.
- Black pepper: Freshly ground is nice if you have it, but whatever you’ve got works.
Cheese and Topping
- Sharp cheddar cheese: Sharp cheddar is my pick because it actually tastes like something after baking. Mild cheddar can get a little bland here.
- Mozzarella cheese: This adds the melty pull and helps the sauce feel extra creamy.
- Parmesan cheese: Parmesan is for that salty, golden top. Freshly grated melts in better, but the tub kind is fine in a pinch.
- Olive oil: This helps the smashed potatoes crisp up and brown, especially around the thinner edges.
- Fresh chives: Chives cut through the richness and make the whole thing taste fresher. Green onions work too.
- Fresh parsley: Totally optional, but I like a little on top for color and a clean finish.
Recipe Instructions
- Preheat the oven: Heat the oven to 425°F and grease a 9×13-inch baking dish.
- Boil the potatoes: Add the potatoes to a large pot, cover with water, salt the water well, and bring to a boil. Cook until fork-tender, about 15 to 20 minutes.
- Drain the potatoes: Drain well, then let the potatoes sit in the colander for about 5 minutes so the steam can dry them out a bit.
- Smash the potatoes: Spread the potatoes in the baking dish and smash each one to about 1/2-inch thick using a glass or potato masher.
- Season the potatoes: Drizzle with olive oil, then lightly season with salt and pepper.
- Start the sauce: Melt the butter in a saucepan over medium heat. Whisk in the flour and cook for 1 minute.
- Thicken the sauce: Slowly whisk in the milk until smooth, then simmer 2 to 4 minutes, whisking, until slightly thickened.
- Add the cheese: Whisk in the sour cream, garlic powder, onion powder, salt, and pepper. Add 1 1/2 cups of the cheddar plus the mozzarella, and whisk until melted and smooth.
- Bake: Pour the sauce over the smashed potatoes, then sprinkle the remaining cheddar and the Parmesan over the top. Bake for 30 to 35 minutes, until bubbling and deeply golden.
- Rest and garnish: Let the bake rest for 5 minutes, then finish with chives and a little parsley before serving.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Let the potatoes steam dry. That quick 5 minutes in the colander matters. Drier potatoes smash cleaner and crisp better once they hit the hot oven.
Don’t smash them too thin. About 1/2-inch is the sweet spot. If they’re paper-thin, you lose the fluffy middle and they can turn a little tough under the sauce.
Whisk the milk in slowly. If you pour it in all at once, the roux can clump. A slow stream while whisking keeps the sauce smooth.
Taste the sauce before you add the potatoes. It should taste a little boldly seasoned on its own. Once it’s on the potatoes and baked, the flavor mellows out.
Want extra crisp edges? Bake the smashed potatoes for about 10 minutes before you pour on the sauce and cheese. I do this when I have a few extra minutes.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Roast chicken: This is one of my favorite sides with a simple roast chicken. Add a green salad or green beans and dinner is done.
- Ham or pork: The tangy cheese sauce is really good with baked ham or pork tenderloin. It also makes sense on a holiday table.
- Steak night: Serve it with grilled steak and something green like asparagus or broccolini. The potatoes are rich, so keep the veg simple.
- BBQ plates: This works with pulled pork, ribs, or burgers when you want something warmer than potato salad. I like extra chives on top for that fresh bite.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store leftovers covered in the fridge for up to 4 days. Reheat individual portions in the microwave, or warm the whole dish in the oven until heated through.
You can also make this recipe ahead by assembling the casserole in the baking dish, covering it tightly, and refrigerating it overnight. Bake the next day when you’re ready.
When baking from cold, you may need to add a few extra minutes to the baking time. If the top is browning too fast, loosely cover with foil and keep going until it’s hot in the center.
If you want them to last longer, freeze individual portions or freeze the whole baked dish in an airtight container. Thaw in the fridge overnight before reheating.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Can I use Greek yogurt instead of sour cream?
Yes. Plain Greek yogurt works well and keeps the sauce a little lighter. I’d stick with full-fat or 2% so the sauce stays creamy and doesn’t taste too sharp.
What other cheeses work well here?
Pepper jack is great if you want a little heat. Gruyere also works really well for a more nutty, “fancier” flavor, especially with the Parmesan on top.
How do I know it’s done baking?
The sauce should be bubbling around the edges and the top should be deeply golden in spots. If it’s bubbling but still pale, give it a few more minutes so the top actually browns.
Can I add bacon or ham?
Yes, and it’s a good idea if you want to make this more of a main dish. Stir cooked crumbled bacon or diced ham into the sauce, or sprinkle it over the potatoes before pouring the sauce on.
Can I use larger potatoes instead of baby potatoes?
You can, but it’s a little more work. Cut them into large chunks so they cook evenly, then smash the chunks in the pan the same way.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Cheesy Smashed Potato Bake
INGREDIENTS
Potatoes
- 3 lb baby Yukon gold potatoes
- 1 tbsp kosher salt for boiling water.
Creamy Cheese Sauce
- 3 tbsp unsalted butter
- 3 tbsp all purpose flour
- 2 cups whole milk
- 1 cup sour cream
- 2 tsp garlic powder
- 1 tsp onion powder
- 1 tsp kosher salt
- ½ tsp black pepper.
Cheese and Topping
- 2 cups shredded sharp cheddar cheese
- ¾ cup shredded mozzarella cheese
- ½ cup grated Parmesan cheese
- 2 tbsp olive oil
- 2 tbsp chopped fresh chives
- fresh parsley for garnish.
INSTRUCTIONS
Boil and Smash
- Heat oven to 425 F and grease a 9x13 inch baking dish
- boil potatoes in salted water until fork tender about 15 to 20 minutes then drain well and let steam dry 5 minutes
- spread potatoes in the baking dish and smash each to about 0.5 inch thick with a glass or potato masher then drizzle with olive oil and lightly season with salt and pepper.
Make Sauce and Bake
- Melt butter in a saucepan over medium heat whisk in flour and cook 1 minute then slowly whisk in milk until smooth and simmer 2 to 4 minutes until slightly thickened
- whisk in sour cream garlic powder onion powder salt pepper and 1.5 cups cheddar plus mozzarella until melted
- pour sauce over smashed potatoes and sprinkle remaining cheddar plus Parmesan over top
- bake 30 to 35 minutes until bubbling and deeply golden then rest 5 minutes and finish with chives and parsley.
