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Cheesy Mashed Potato Casserole

Try this cheesy mashed potato casserole for when you are looking for a way to make instant mashed potatoes into something more tasty.  This recipe for Cheesy Mashed Potato Casserole combines mashed potatoes, sour cream, herbs, cheese, and more! , this recipe was created out of necessity, no time to shop, and a few ingredients will make for a unique side dish. Sour cream, french fried onion rings, seasonings, and some cheddar cheese make this a potato dish that people will ask for your Cheesy Mashed Potato Casserole.

mashed potatoes with cheese and french fried onions

I must confess sometimes I use instant mashed potatoes, sometimes I have fed them to my guests. Most people won’t even know the difference if you add a few extra ingredients to the potatoes. When making instant mashed potatoes, I always use a little extra butter, and I will swap the milk for some half and half if I have it available, these two ingredients will make the potatoes nice and rich.  Let me just say you could make this dish with real potatoes, I would use about 2 pounds of potatoes when making this dish from scratch.

Cheesy Mashed Potato Casserole

Cheesy mashed potatoes

  • Author:
  • Recipe Type: Casserole Recipes, Side Dish Recipes
  • Prep time:10 minutes
  • Cook time:20 minutes
  • Serves: 8
Cheesy mashed potatoes

Cheesy mashed potatoes are a creamy and savory side dish that you can make with instant mashed potatoes.


  • Instant Mashed Potatoes - prepared according to package directions for 8 servings
  • 3/4 cup sour cream
  • 1 teaspoon dried chives
  • 1 teaspoon dried parsley
  • 1/2 teaspoon black pepper
  • 1 cup French's Fried Onion Rings
  • 3/4 cup shredded cheddar cheese


Preheat oven to 350 degrees. Prepare instant mashed potatoes according to the package directions. Add sour cream, chives, parsley, and pepper to mashed potatoes. Place mashed potatoes in a 1 1/2 quart casserole dish. Top mashed potatoes with cheddar cheese, and sprinkle the French's Onion Rings around the edge of the casserole. Bake for about 20 minutes or until cheese melts.

This dish can be made ahead and then reheat later. If you are going to reheat this dish later, add the shredded cheese, but wait to top with the French Fried Onion Rings until you are ready to reheat this dish.

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