How to Make Cheesy Mashed Potato Casserole

According to Statista, over 70% of U.S. households regularly purchase potatoes, making them one of the most versatile and loved ingredients in the country source. And why not? They’re affordable, filling, and endlessly customizable.

This mashed potato casserole adds richness with sour cream and cream cheese, balances flavor with a touch of onion, and finishes with a buttery crust. It’s the kind of dish you bring to a potluck—and leave with an empty dish. Let’s walk you through making the creamiest, cheesiest mashed potato casserole, made easier with tools from Zulay Kitchen.

How to Make Cheesy Mashed Potato Casserole

Prep Time: 20 minutes | Cook Time: 30 minutes

Servings: 6–8

Ingredients

• • 10 medium-sized potatoes, peeled
  • 1 cup sour cream
  • 8 oz cream cheese
  • 1 medium onion, finely diced
  • 2–3 tablespoons butter, melted
  • Salt and pepper, to taste
  • 1 teaspoon paprika (optional)

Instructions

Step 1: Boil the Potatoes

1. 1. Using a vegetable peeler, peel the potatoes then place them in a large soup pot.
   2. Cover with cold water and bring to a boil. Add a generous pinch of salt.
   3. Cook until the potatoes are soft when pierced with a fork—about 15–18 minutes.
   4. Drain and return the potatoes to the pot.

Step 2: Mash and Mix

1. 1. Grab a potato masher to mash the potatoes until smooth and lump-free.
   2. Add sour cream, cream cheese, and finely diced onion. Season with salt and pepper.
   3. Mix until fully combined using a silicone spatula or hand mixer if you prefer extra smoothness.

Step 3: Assemble the Casserole

1. 1. Transfer the mashed potato mixture into a greased 2-quart casserole dish or into an enameled Dutch oven if you have one. 
   2. Smooth out the top and let the casserole cool (you can refrigerate for up to 24 hours at this point).

Step 4: Bake and Serve

1. 1. Preheat your oven to 350°F.
   2. Just before baking, drizzle melted butter over the top and sprinkle with paprika (if using).
   3. Bake for 30 minutes, or until the top is golden and the edges begin to crisp.
   4. Serve hot and enjoy the creamy, cheesy goodness!

Tips, Variations & Substitutions

• Add shredded cheddar or mozzarella to the potato mixture for an extra cheesy casserole.
• Top with breadcrumbs or crushed crackers before baking for a crunchy texture.
• Mix in chopped cooked bacon or green onions for more depth and a little bite.
• Make it dairy-free by using vegan cream cheese and sour cream alternatives.
• Want a garlic twist? Roast 3–4 cloves and mash them in with the potatoes.

Health Benefits of Mashed Potatoes

• Potatoes are rich in potassium, vitamin B6, and fiber (especially if you leave the skins on).
• Onions add antioxidants and subtle flavor without added calories.
• Sour cream and cream cheese, when used moderately, provide calcium and protein.
• Paprika isn’t just for color—it’s loaded with vitamin A and can boost metabolism.

Why You Need Mashed Potato Casserole in Your Life

There’s something about mashed potatoes that feels homey. When you take that base and elevate it with cream cheese, sour cream, and the perfect bake, it becomes something unforgettable.

This Mashed Potato Casserole is perfect for:

• • Family dinners
  • Thanksgiving or holiday meals
  • Potlucks or parties
  • Comfort food on a cold night

Even better, with Zulay Kitchen tools, making it is faster, easier, and cleaner. 

Other Kitchen Tools You Need for This Recipe

Looking to make prep easier and your dishes even better? Add these to your lineup:

• • Cutting Board – Finely dice onions without slips or mess.
  • Magnetic Measuring Spoons – Stackable, precise, and convenient to store.
  • Mixing Bowl Set – Great for prepping and mixing mashed potatoes.

Frequently Asked Questions About This Recipe

Can I make this casserole in advance?

Yes! This dish is perfect for make-ahead meals. After assembling, cover the dish tightly and refrigerate for up to 24 hours. When ready to bake, remove it from the fridge, add melted butter and paprika, and bake as directed. You may need to add 5–10 extra minutes if it's going in cold.

What kind of potatoes work best for this recipe?

We recommend using Yukon Gold or Russet potatoes. Yukon Golds create a creamy, buttery mash, while Russets are fluffier and absorb flavors well. Avoid waxy potatoes like red or fingerling—they don’t mash as smoothly and can become gluey.

Can I freeze leftover mashed potato casserole?

Absolutely. Once cooled, portion the casserole into airtight containers or wrap the whole dish tightly in plastic and foil. Freeze for up to 2 months. 

Can I add protein to make it a full meal?

Definitely. Stir in cooked ground turkey, shredded chicken, or crumbled bacon before baking to turn it into a hearty one-dish meal. You can also serve it alongside grilled meats or roasted vegetables for a more complete plate.

Is this casserole gluten-free?

Yes, this recipe is naturally gluten-free—just make sure your ingredients (like cream cheese and sour cream) are labeled gluten-free. Avoid adding any toppings (like breadcrumbs) unless they're specifically gluten-free.

What’s the best way to reheat leftovers?

You can reheat single servings in the microwave for 1–2 minutes or warm larger portions in the oven at 350°F, covered with foil to prevent drying out. Add a splash of milk or a pat of butter on top before reheating for best texture.

Can I substitute Greek yogurt for sour cream?

Yes! Plain Greek yogurt is a great substitute for sour cream. It adds a similar tang and creaminess while reducing fat and increasing protein. Just use a full-fat variety for the closest match in texture and flavor.