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 in a baking dish.

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

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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 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!

Type Of Green Beans To Use

I use fresh, cooked green beans that I have boiled until tender. You can use canned green beans if you prefer or frozen green beans that have been cooked according to package directions.

Mashed Potato Green Bean Casserole

Add A Little Spice

To make this recipe spicy, add a pinch or two of cayenne pepper.

Make Ahead and Storage

Can be assembled ahead of time but wait to add the onion topping just before baking. Leftovers will keep in an airtight container in the refrigerator for 3 days. Reheat in a 350 degree oven to crisp the topping back up.

Mashed Potato Green Bean Casserole

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Mashed Potato Green Bean Casserole

5 from 4 votes
Prep: 10 minutes
Cook: 30 minutes
Total: 40 minutes
Servings: 8 -10 servings
Mashed Potato and Green Bean Casserole is a delicous mash-up of 2 Thanksgiving favorites. You are going to love the crispy onion topping.
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Ingredients

  • 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

Instructions 

  • Preheat oven to 350 degrees.
  • Transfer Simply Potatoes Mashed to a lightly greased 9×13-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.

Notes

I like to use fresh green beans that I have boiled until tender, but you can use canned green beans that have been drained well or frozen green beans that have been cooked according to package directions.

Nutrition

Calories: 397kcal | Carbohydrates: 45g | Protein: 12g | Fat: 19g | Saturated Fat: 9g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 2g | Cholesterol: 24mg | Sodium: 639mg | Potassium: 912mg | Fiber: 5g | Sugar: 4g | Vitamin A: 612IU | Vitamin C: 40mg | Calcium: 205mg | Iron: 2mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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

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46 Comments

  1. Aunt Di says:

    This is one of the yummiest recipes weโ€™ve ever tried! Highly recommend for the holiday season, but tbh, hubs wants it year round! Itโ€™s so good my sis said this is the one recipe I must make for thanksgiving! Itโ€™s not healthy, but worth an annual splurge!

  2. Holly says:

    This was a family favorite and so easy to put together.

  3. Simone Musil says:

    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.

  4. Pam P says:

    I do not add milk. I add both sour cream and cream cheese in itsโ€™ place. So good and creamy.