Three Cheese Mashed Potato Casserole Bake | @whiteonrice

3-Cheese Garlic Mashed Potato Casserole

Yield: 12 Servings
Prep Time:
20 mins
Cook Time:
40 mins
Total Time:
1 hr
These are the perfect make-ahead-potatoes. Chill the whole casserole dish, but before baking, allow the whole dish to come to room temperature a bit before baking.  If you bake the dish straight from the fridge, then add extra baking time to compensate for the cold potatoes. And use what ever combination of cheese that you love! 
Our favorite potato to use for this recipe is Yukon Golds. If you can't find any, a regular russet works great.


  • Butter or cooking spray
  • 4 pounds potatoes (Russet or gold potatoes preferred)
  • 1 teaspoon garlic salt
  • 1/2 teaspoon onion salt
  • 1/2 cup sour cream
  • 3/4 cup milk
  • 1/4 cup butter , melted (1/2 stick)
  • 1 cup shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 1 cup shredded Parmesan , divided
  • Kosher salt , to taste
  • Freshly ground black pepper , to taste
  • 1/2 cup plain bread crumbs or panko bread crumbs


  1. Preheat the oven to 400° F. Grease 9" x 13" with butter or cooking spray.
  2. Peel potatoes and cut into 1-inch pieces. Cook the potatoes in a large pot of well salted boiling water until they are soft and tender. This should be about 10-15 minutes, depending on the size and type of potato.
  3. Drain the potatoes and place in a large bowl or back into the same pot. Add garlic salt, onion salt, sour cream, milk and melted butter. Mash the potatoes to your desired texture.
  4. Mix in the cheese, reserving about 1/4 cup of the parmesan for topping. Season, to taste, with salt and pepper. Transfer the potatoes to the prepared baking dish. Sprinkle the remaining parmesan cheese and bread crumbs over the mashed potatoes.
  5. Bake, uncovered, until the cheese/bread crumb topping is golden brown, about 20 minutes.

Recipe Video

Recipe Notes

We’ve made this garlic mashed potato casserole with different cheeses and it’s hard to choose. Here's some favorites:
  • Try goat cheese if you like the tang and flavor. It's a great melting cheese too.
  • Parmigiano reggiano : you just can't beat the nutty, rich flavor of this amazing cheese.
  • Smoked Gouda: we LOVE smoked gouda and when it melts with the mashed potatoes, the aroma is fantastic
  • Smoked, aged cheddar: get your hands on some of this rich, aromatic cheese and you'll never regret it.
  • Mozzarella: this is a fantastic melting cheese and when combined with the others, you'll get a fantastic cheese pull.

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