Mashed Potato Green Bean Casserole

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Mashed Potato Green Bean Casserole is a delicious combination of two of my favorite Thanksgiving sides. On the bottom, a creamy layer of mashed potatoes covered by a cheesy green bean casserole.

Mashed Potato Green Bean Casserole


Each one tastes incredible on its own, but even better when combined into one extraordinary side.

Mashed Potato Green Bean Casserole


Best thing about the recipe?

It’s a total breeze to prepare thanks to Simply Potatoes Traditional Mashed Potatoes®.

Mashed Potato Green Bean Casserole


Simply Potatoes Traditional Mashed Potatoes  are made from real ingredients, fresh never frozen potatoes. You can find them in the refrigerated section of your store or learn more about them here.

No time wasted peeling potatoes. These potatoes are ready to be heated and eaten. So much prep time is saved and they are my go-to secret weapon to easily prepare a meal the whole family will enjoy.

Mashed Potato Green Bean Casserole


I’ve yet to meet a kid who doesn’t like mashed potatoes and I love how versatile Simply Potatoes Traditional Mashed Potatoes are. They are delicious as is or in your favorite recipes and so much fun to use to create fun, unique recipes like this Mashed Potato Green Bean Casserole.

Since most of the work is done for you, you can quickly and easily transform them into Cheesy Bacon Mashed Potatoes or make a weeknight Shepherd’s Pie in no time at all. The options are endless.

But I think you’re really going to love the way a layer of Green Bean Casserole (with cheddar cheese no less!) tastes on top of these mashed potatoes. I use fresh green beans, but you can use canned, plus a can of cream of mushroom soup, a little milk and soy sauce, and lots of French fried onions.

Trust me when I say if you’re a fan of green beans casserole and you like mashed potatoes (who doesn’t?) you are going to love this Mashed Potato Green Bean Casserole!

Mashed Potato Green Bean Casserole

Try These Other Thanksgiving Favorites:

Mashed Potato Green Bean Casserole

Mashed Potato Green Bean Casserole

Course: Side Dish
Cuisine: Southern
Keyword: Casserole, Thanksgiving
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 8 -10 servings
Calories: 396kcal
Mashed Potato and Green Bean Casserole is a delicous mash-up of 2 Thanksgiving favorites.
Print Recipe


  • 2 (24-ounce) packages Simply Potatoes Traditional Mashed Potatoes
  • black pepper, to taste
  • 4 cups cooked green beans
  • 1 (10.5-ounce) can condensed cream of mushroom soup
  • 1/3 cup milk
  • 1 teaspoon soy sauce
  • 1 1/2 cups shredded cheddar cheese, divided
  • 1 (6-ounce) can French fried onions, divided


  • Preheat oven to 350 degrees.
  • Transfer Simply Potatoes Mashed to a lightly greased 9x13-inch pan and use a rubber spatula to smooth into an even layer.
  • Season potatoes to taste with pepper.
  • In a large bowl, combine green beans, soup, milk, soy sauce, cheddar cheese, and half of French fried onions. Stir to mix and pour on top of potatoes.
  • Sprinkle remaining onions on top.
  • Place in oven an bake for 25 to 30 minutes.


Calories: 396kcal



This is a sponsored conversation written by me on behalf of Simply Potatoes®. The opinions and text are all mine.

44 thoughts on “Mashed Potato Green Bean Casserole

  1. I boil my potatoes in vegetable broth and water. I also mix in 1 tbsp. Garlic Paste. 1 tbsp. Sugar. 1/4 Cup finely chopped red onion. 1/8th cup shredded white cheddar cheese. A stick of REAL butter. This is for 5 lb. Bag of russett potatoes (10 potatoes total) 1 tbsp salt and 1 tsp black pepper. 1/= cup to 1/2 cup whole milk warm or room temperature. I NEVER use a mixer. Makes potatoes gummy. I use a hand masher and don’t over do it.

  2. I love this sound and look of this dish… but when it comes to Mashed Potatoes… I’m and Old Fart… will eat anything in front of me…. Like all the ideas here…. but for me… Melted Butter and Salt and Pepper… ♥

  3. when I make mashed potatoes I use evaporated milk instead of cream then the usual butter, salt and pepper. after reading several recipes in this posting, the next time I will use mayonnaise instead of butter!

  4. A favorite weeknight quick-fix is to mix corn niblets and creamed corn together for a gravy on our mashed potatoes…. lots of butter of course 🙂

  5. My potatoes always get LOTS of garlic and cheddar, sometimes parmesan, and bit of water or skim milk if too thick. Have been looking for recipes to use my bountiful bean harvest, so this looks like a winner

  6. I love to add chopped scallions, salt and pepper, a little horseradish, and sour cream. Delicious and a little different. People will ask what is that great taste in the potatoes.

  7. I absolutely love blue cheese with my potatoes! That’s only if I’m making them just for myself though, for my family I like to add chives and sour cream.

  8. I love to add garlic to mashed potatoes and top with a butercrumb topping also! So yummy. Sometimes I like to dice some scallions for the top as well. I just love mashed potatoes.

  9. Garlic mashed potatoes have to be my favorite! My cousin is making them today and I can’t wait! There’s so much garlic, yum!! Happy Thanksgiving!

  10. REAL BUTTER! I grew up calling margarine “butter” and ever had the real stuff until I was an adult. Never have gone back!

  11. I like to make loaded mashed potatoes sort of like loaded baked potatoes. I add: cheese, milk/cream, sour cream, chives, butter, and bacon.

  12. These potatoes have some real razzle dazzle! I could pretty much just have mashed potatoes for supper, and you’re getting me one step closer to actually being able to call them a meal and get away with it. Because people make meals out of sides, right? I wouldn’t just be eating potatoes anymore. ?

  13. A little cream, a fair amount of butter and a sprinkle of salt and I’m set! Especially if there’s fresh turkey gravy to ladle over them.

  14. Thanks for the giveaway and great recipe. Unfortunately, I do know a kid who doesn’t like mashed potatoes and for the life of me, I can’t figure out why. I’ve tried them every kid friendly way you can imagine. Anyway, I like to add roasted garlic to my mashed potatoes. Since the munchkin won’t eat them, I only make them for the grown ups and we like lots of garlic, lol.

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