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Katie's Cucina

Mashed Potato Soup

Use up your leftover mashed potatoes and make this decadent and creamy mashed potato soup!

So the leftovers are dwindling? You have random bits and pieces of your holiday dinner scattered throughout your refrigerator? Did you make one, too many potatoes this year? All you need is 3 cups of leftover mashed potatoes to make the most decadent mashed potato soup I’ve ever tasted. I mean this soup is rich, creamy, and full of flavor with only a few ingredients!

My goal after the holidays is to use up and re-purpose all my leftovers. I love to transform them into brand new meals so that everyone isn’t tired of eating a ham dinner for the 15th time in just 3 days. I made over 10 lbs of potatoes for Thanksgiving for just 8 people. That meant that everyone had to eat over a pound of mashed potatoes and we would still have leftovers. The day after any holiday (when I have leftover mashed potatoes) I always make my easy potato pancakes. But then after that if I have any leftover I’m always confused as to what else to make. I did try my friend Joanne’s recipe for Crispy Mashed Potato Mounds which were out of this world delicious. But even after that I still had about 3 cups of leftover mashed potatoes. That is when the thoughts of baked potato soup crossed my mind. Well I should say, Mashed Potato Soup. All I needed were some green onions and bacon to top off the soup and I think I would have been in heaven! With or without the bacon this recipe for Mashed Potato Soup was out of this world delicious! Go ahead, give it a try and use up the last of your leftover mashed potatoes!

Print Recipe

Mashed Potato Soup

Yield: 4

Prep Time: 5 minutes

Cook Time: 25 minutes

Total Time: 30 minutes


  • 2 tbsp butter
  • 1/2 small onion, diced
  • 1 tbsp all-purpose flour
  • 2-1/2 cups whole milk
  • 3 cups leftover mashed potatoes
  • salt and pepper to taste
  • dried parsley and shredded cheddar cheese for garnish


  1. In a soup pot melt butter on medium heat, then add in onion. Cook until golden brown (almost caramelized for 10 minutes).
  2. Once the onions are golden in color add the all-purpose flour and mix well until the onions have been coated with the flour mixture. Add the whole milk and stir for one minute.
  3. Then add in the mashed potatoes. Mixing until all the potatoes have broken up. Cook on medium-low heat for 10-15 minutes or until potatoes are smooth. Taste the soup and add salt and black pepper if desired.
  4. Ladle into bowls and top with dried parsley, shredded cheddar cheese, and cracked black pepper. Enjoy!

Katie Original Recipe




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17 Responses to “Mashed Potato Soup”

  1. Genie Robbins posted on December 29, 2013 at 5:08 pm (#)

    I love homemade potato soup but have never tried it with mashed taters. Sure looks easy!

  2. Kayle (The Cooking Actress) posted on January 1, 2014 at 4:56 pm (#)

    I NEED to try this! Pinning!

  3. Kelly Foy posted on January 4, 2014 at 7:00 pm (#)

    Made this tonight with left overs from Christmas.. Our mashed potatoes were originally made with Philadelphia Savoury Garlic Cooking Cream. Amazing.. And so fast! Pinned it!

    • Katie replied on January 5th, 2014 at 5:26 pm

      Kelly so glad you loved it! I’ll have to make it with the Philadelphia Savory Garlic Cooking Cream next time! 🙂

  4. Nutmeg Nanny posted on January 6, 2014 at 6:27 pm (#)

    Mashed potatoes and soup, oh my thats a dream! I love it 🙂

    • Katie replied on January 7th, 2014 at 5:32 pm

      Mine too! 🙂

  5. Jennifer posted on September 12, 2014 at 9:02 pm (#)

    So good, the picky kids LOVED it!

    • Katie replied on September 14th, 2014 at 6:56 am

      Jennifer that’s great to read! Glad you and your family enjoyed it.

  6. Amanda posted on August 6, 2015 at 9:00 am (#)

    Hi Katie!! This mashed potato soup looks so easy, I had to share it on my blog today. I was compiling a list of things to do with left over mashed potatoes and your soup was first on my list!! 😀

    • Katie replied on August 18th, 2015 at 10:47 am

      Thanks Amanda! Yes–so good!!!

  7. Joan Buckley posted on December 18, 2017 at 8:16 pm (#)

    Great recipe – love it!
    Isn’t your last name Polish?
    Why not “katieskuchnia” ?
    I grew up with many Polish people in Manchester NH & always loved the meals I shared with them. I still make many Polish dishes!

    • Katie replied on December 30th, 2017 at 8:45 pm

      Hi Joan, thank you for taking the time to share. My father in-law said that years ago! lol I married a Polish man; however, I am part Polish but also Italian! Hence the “cucina”!


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