Name: Mouthwatering Mashed Potato Casserole
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: American
Ingredients: 3 pounds Yukon Gold potatoes, peeled and chopped ½ cup unsalted butter 1 cup sour cream 4 ounces cream cheese ½ cup whole milk 1 ½ cups shredded cheddar cheese, divided 1 teaspoon garlic powder 1 ½ teaspoons salt ½ teaspoon black pepper 1 teaspoon fresh thyme leaves (optional)

If you’re on the hunt for a comforting, crowd-pleasing side dish that elevates even the simplest weeknight dinner or adds charm to your holiday table, this Mouthwatering Mashed Potato Casserole is exactly what you need. Creamy, buttery mashed potatoes are whipped to perfection, then baked until golden and slightly crisp on top, creating a delightful contrast of textures in every bite. It’s a dish that hugs you from the inside out.

This casserole takes your traditional mashed potatoes up a notch with a baked, cheesy finish and a smooth, luscious interior. It’s the kind of make-ahead dish that simplifies your hosting duties while delivering rich, homemade flavor. Whether you’re planning a Thanksgiving feast or simply craving cozy comfort food, this one never disappoints.

What Makes This Mashed Potato Casserole So Special?

This isn’t your average mashed potato side. Baking the casserole allows the top to develop a slightly crispy, golden-brown crust that contrasts beautifully with the creamy interior. You can also make it ahead of time, refrigerate it, and pop it in the oven just before dinner—ideal for busy days or when you’re entertaining. Add-ins like sour cream, cheese, or garlic can personalize it even more, turning it into a signature comfort dish.

Ingredients for the Mouthwatering Mashed Potato Casserole

Yukon Gold Potatoes – These potatoes bring a naturally buttery flavor and creamy texture that’s perfect for mashing and baking.

Butter – A generous amount of butter gives the potatoes their silky richness.

Sour Cream – Adds a tangy creaminess that balances the richness and adds body to the mash.

Cream Cheese – For that luxurious mouthfeel and a subtle tangy twist.

Milk – Helps to loosen up the mash to the perfect consistency.

Shredded Cheddar Cheese – Melted throughout and sprinkled on top, cheddar delivers salty, sharp flavor and that irresistible golden crust.

Garlic Powder – Adds a soft garlicky warmth without overpowering the dish.

Salt and Pepper – Essential for seasoning and balance.

Fresh Thyme (optional) – A few leaves sprinkled on top bring a fresh aroma and flavor contrast.

How To Make the Mouthwatering Mashed Potato Casserole

Step 1: Boil the Potatoes

Peel and chop your Yukon Gold potatoes into evenly-sized chunks. Place them in a large pot of salted water and bring to a boil. Cook until fork-tender, about 15-20 minutes. Drain well.

Step 2: Mash Until Creamy

Return the drained potatoes to the warm pot. Add butter, cream cheese, sour cream, milk, garlic powder, salt, and pepper. Mash everything together until smooth and creamy. For an extra whipped texture, you can use a hand mixer.

Step 3: Add the Cheese

Fold in half of the shredded cheddar cheese into the mashed mixture. This infuses the mash with a deliciously cheesy base that melts beautifully.

Step 4: Transfer to Baking Dish

Spoon the mashed potatoes into a greased 9×13-inch baking dish. Spread them evenly and use a fork to create gentle ridges on top, which will brown beautifully.

Step 5: Top and Bake

Sprinkle the remaining cheddar cheese over the top. Bake at 375°F (190°C) for 25–30 minutes, or until the top is golden and slightly crisp. Add fresh thyme if desired before serving.

How to Serve and Store This Mashed Potato Casserole

Serve this casserole straight from the oven while it’s hot and the cheese is perfectly melted. It pairs wonderfully with roasted meats, turkey, or as a standalone vegetarian comfort dish. Garnish with extra thyme or chopped chives for a fresh pop of color.

To store leftovers, let the casserole cool to room temperature and refrigerate in an airtight container for up to 4 days. Reheat in the oven at 350°F until warmed through, or microwave individual portions. This dish also freezes well—just thaw overnight in the fridge before reheating.

Frequently Asked Questions

Can I make this casserole ahead of time?

Yes! You can prepare the entire casserole up to two days in advance. Cover and refrigerate it, then bake when ready to serve.

Can I use a different type of potato?

Absolutely. Russet potatoes also work well, though Yukon Golds are preferred for their creamier texture and natural buttery flavor.

Can I add bacon or other mix-ins?

Definitely. Crispy bacon bits, caramelized onions, or roasted garlic make delicious additions. Fold them in with the mashed potatoes before baking.

Is this recipe gluten-free?

Yes, all ingredients listed are naturally gluten-free. Just be sure any added extras (like bacon or cheese) are certified gluten-free.

How can I make it dairy-free?

You can substitute plant-based versions of butter, milk, cream cheese, and cheese to make a fully dairy-free version. Keep in mind the texture may vary slightly.