Leftover Mashed Potatoes Make Great Soup…

It doesn’t matter who we’re having or what we’re eating, if I’m cooking for more than our little clan, I just can’t get the amount right.  Faced with a holiday dinner, I routinely make about twice what is actually required, sure that I may not be making enough.  In my mind every guest is a 14 year old athlete with a limitless metabolism and elastic waistband.

Thus our recent Thanksgiving dinner left us with a giant container of mashed potatoes in the fridge.  Now normally I am just fine with lots of mashed potatoes around, but truth to tell I am the only REAL mashed potato fanatic in the house.  Mr. Little Sis likes them, but can’t eat them for days and the kids are just not into them at all – there’s only so much a girl can do faced with all that mash.  I hated to think of it going to waste… surely there is another way.

While I could have made mashed potato pancakes, we’d had latkes just a few nights before, so no dice there. After being tired, cold, and a little lonely after the long weekend playing games and watching movies with the family, soup just seemed like the thing to do.  And what could be easier than making soup from mashed potatoes, especially if you have a leek.  This really doesn’t merit a recipe, but I’ll write it out that way to make it easy to follow.  You’re welcome.

Leftover Mashed Potato Leek Soup with Wilted Spinach and Basil

  • olive oil for the potIMG_0404
  • 1 leek, white and light green parts cleaned and chopped *
  • 4 cups mashed potatoes (I used these non-dairy beauties)
  • 2 c water
  • 1/2 t salt
  • fresh ground pepper
  • 1 c coconut milk (or whatever you prefer)
  • olive oil for the pan
  • About 5 ounces of fresh spinach (or as much or little as you like – it DOES shrink a lot)
  • 1 small clove garlic, minced or pressed
  • small handful of fresh basil, chopped

* Leeks are dirty little suckers.  When they grow up through the soil, they bring quite a bit with them, trapped in the layers.  Cleaning them can be tricky.  I simply cut the portion of the leek I intend to use into quarters  the long way.  I think place those quarters (they will separate – it’s okay) into a bowl of water, let them sit while I prepare other bits, swish them around and then rinse.  Works like a charm, every time, and I learned it at fancy cooking school, so it must be right, right? ;-) I can say that the bowl of water is always cloudy and dirty – so it seems to do the trick.

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Warm olive oil in the bottom of a soup or stock pot, place chopped leeks and a sprinkle of salt in pot, sautéing and stirring occasionally until the leeks are tender and the white parts are a little translucent. Add the mashed potatoes and stir to combine.  Add water and salt and stir to combine. Here’s where we’re gonna have some variation.  If your mashed potatoes were perfectly cooked, had no lumps and were smooth as silk, you will only need to bring your pot of yum up to temp.  If, like most of us, your potatoes were delicious but slightly less than perfect, you may want to bring the pot to a gentle boil to cook the potatoes just a little bit as the flavors mingle.  When potatoes have reached the texture you prefer, add the coconut (or whatever) milk and ground pepper.  While the soup comes back up to temp, prepare the spinach.

Warm olive oil to low-medium in a pan (I used cast iron). Add spinach, a sprinkle of salt, and the garlic to the pan.  Turn/stir spinach frequently to encourage wilting throughout.  When nearly all wilted, add the fresh basil. Stir for a little while longer. When all spinach is wilted and bright green, remove from heat.

Serve soup with a few forkfuls of spinach, some lovely bread (ours was a non-dairy apple cheddar quick bread which I’ll share soon), and a salad.  Delicious, satisfying, and a great way to use too much comfort food. Hope your holiday provided you with memories, laughter, and leftovers you love to eat over and over again.

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13 responses

  1. I too am an over-cooker at Thanksgiving. 3 pans full of stuffing- one got tossed, and another got frozen! They were small, but still! This sounds delicious! I have leeks in the fridge, and put the left over mashed potatoes (2 quart sized bags full!) in the freezer for shepherd’s pie some day. I could just use a bag for the soup! Perfect! :)

      • I did it- I made the soup! Before the leeks shriveled and gave up on me!

        So easy, so quick, so yummy! And filling, I barely ate half my bowl! I didn’t add the spinach or basil, just because I didn’t have them. We’re vegetarian, but not vegan, so I just used half and half instead of the coconut milk, but I would definitely recommend your version to my vegan Momma! In fact, I already did! :)

        Delicious, and definitely a great way to use up the old mashed potatoes! Thanks for sharing the recipe!

  2. mmm, mashed potato soup. I love how simple this recipe is. It could really be a base for so many other combinations of soup. I think I should mash some potatoes this weekend just to have on hand for soups now. Thank you for sharing on Foodie Friday

  3. What a great solution for leftover mashed potatoes,we would just love this soup. Hope you are staying warm and cozy in this cold weather and thank you so much for sharing with Full Plate Thursday.
    Come Back Soon!
    Miz Helen

  4. Pingback: Friday Faves, Can You Help? | Living Simply Free

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