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Mashed Potato Casserole


"My mom gave me this recipe years ago. Every time I make it, people always request the recipe. It's really good and easy, made with instant potato mix and flavored with cream cheese and onion dip."
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45 m servings 423 cals
Original recipe yields 7 servings (6 - 8 servings)


  • Calories:
  • 423 kcal
  • 21%
  • Fat:
  • 34 g
  • 52%
  • Carbs:
  • 21.3g
  • 7%
  • Protein:
  • 8.2 g
  • 16%
  • Cholesterol:
  • 91 mg
  • 30%
  • Sodium:
  • 883 mg
  • 35%

Based on a 2,000 calorie diet

See full nutrition

Nutritional Information

1 Serving
Servings Per Recipe:
Amount Per Serving
  • * Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
  • ** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
  • (-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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  • Prep

  • Cook

  • Ready In

  1. Preheat oven to 350 degrees F (175 degrees C). Grease one 2 1/2 quart casserole dish.
  2. Blend together milk, cream cheese, onion dip and eggs.
  3. In a saucepan over medium heat, combine water, margarine and salt. Bring to a boil and add instant potato mix; mix well. Add cream cheese mixture, mix well and pour into prepared dish.
  4. Dot the top with margarine and bake at 350 degrees F (175 degrees C) for 30 to 45 minutes.

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Read all reviews 102
  1. 115 Ratings

Most helpful positive review

Hi! I'm Mary, the person who sent in the recipe. I read some of the reviews and I hope people understood that the onion dip used is the ready made kind that you buy in the refigerated section of...

Most helpful critical review

Made these for dinner tonight, lucky for me my SO is a good sport about new recipes. I followed this recipe to the letter, and it turned out awful. Was way to soupy. I will add more Potato Flak...

Most helpful
Most positive
Least positive

Hi! I'm Mary, the person who sent in the recipe. I read some of the reviews and I hope people understood that the onion dip used is the ready made kind that you buy in the refigerated section of...

I made this casserole yesterday (with a couple of changes), and it was delicious! Instead of the onion dip, I combined a package of Ranch Dressing mix with an 8-ounce carton of sour cream and s...

I opt. for 8 oz light sour cream vs. the onion dip. Also use light cream cheese and cut the butter down to 1/4 a cup...I have had it all different ways, very yummy and much faster than cubing/b...

Love this! I'm weird- I like instant mashed potatoes better than real! So I knew I had to try this recipe. After reading the reviews, I decided to use 1 1/3 c. milk. It worked out great. Baked 3...

My family couldn't get enough of these potatoes! I sub'ed sour cream for cream cheese as some others did and used prepared onion dip right out of the dairy case at the grocer. I thought it would...

I made this recipe for a large family Christmas gathering. It was very good and everyone kept going on about how good it was. The only bad thing...the recipe calls for one "PACKAGE" of onion ...

I've made this several times now, and it never lasts long. Rather than 8 oz. of onion dip, I just use a 1.5 oz. packet of dry onion chip dip mix. This is a delicious side dish, thanks for the ...

Since I was doing all the cooking this Thanksgiving, I wanted to save time on preparing somethings so I chose this recipe...NOBODY knew they were instant mashed potatoes and I didn't mention it ...

Awesome new way to make mashed potatoes!! Just be sure that the baking dish is well greased as it tends to stick but overall very tasty! Next time, I'm going to double the recipe so we all get o...