Caramelized Onion Mashed Potato Soup!

Total Time
1hr 15mins
Prep 30 mins
Cook 45 mins

Combo of French onion soup and creamy potato soup. A nice use for leftover mashed potatoes is in this soup used to thicken and giving more creamy comfort without cream or flour. Caramelized Sherried Onions or Caramelized Adobo Onions can be followed for this soup for a different twist.

Ingredients Nutrition


  1. Heat the oil and butter in a large pot over medium high heat till it stops sizzling.
  2. Add onions and reduce the heat to medium-low.
  3. Cook slowly, stirring occasionally, until golden brown and caramelized, about 15 minutes. Add garlic cook 15 minutes. Add pepper, pepper flakes, bay leaf, thyme and sugar.
  4. Pour in sherry, deglazing pot and reduce for 1 minute.
  5. Add Broth and Worcestershire sauce.
  6. Bring to a boil lower heat to a simmer and cook for 10 more minutes.
  7. Add mashed potatoes stirring in till creamy smooth and heated throughout. Taste and adjust seasoning. Salt should wait till now because the mashed potatoes, broth and Worcestershire sauce all contain salt.
  8. Toast bread in oven and top with your favorite cheese and place on top of soup and serve topped with a garnish of scallions.


Most Helpful

Made this today for lunch. Due to weather, we didn't go to work, but I did some work from home. My boss stopped over with another co workers so I made this. I just made some quick mashed spuds in the micro and presto, spuds! This was great. I got some wonderful onions from the market and plenty of herbs so this was great. I didn't have croissants but some not baguettes sliced which worked fine and I almost always have gruyere which is a fave of mine. What a nice creamy soup. No complaints on this end and will definitely make again, it was very very good. 1 change, I added a bit more thyme but I also used fresh, but a tablespoon, but I really enjoy thyme. Only change. Perfect as is. And it didn't take long. I had 2 lbs of shrimp to cook, so we had peel and eat warm garlic shrimp and soup. Nothing more needed. It was heavenly and on a very very cold day even better. Thx for the great recipe.

SarasotaCook January 06, 2010

Amazing soup. Careful not to put too much hot in, otherwise you will probably want to stick to the recipe as outlined. Served this at a party and it was the only soup that disappeared. The great flavor keeps coming at you even to last spoonful. Thanks for posting this great soup recipe.

cast-iron-cook December 28, 2009

Made this for our dinner last night. DH and I really enjoyed it. It had a bit more spice than I like in this type of soup. I would try half the pepper the next time I make it. It also took longer than 15 minutes to carmelize the onion and it still didn't get particularly brown. I used french bread and gruyere for the topping. Thanks for posting.

GibbyLou February 10, 2011

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