Keto Mushroom Soup

Published on Feb 8, 2025. Updated on Jan 14, 2026. By Tayo. This post may contain affiliate links. See Disclosure. — Leave a Comment

This keto mushroom soup is a wonderful alternative to store-bought cream of mushroom soup. It has a soothing, earthy flavor that is so nourishing and comforting!

A bowl of keto mushroom soup with a spoon on the side

This homemade low-carb soup will surely hit the spot whenever you need something warm and relaxing. Although canned soups may seem more convenient, nothing beats the fresh taste of homemade soup. Store-bought mushroom soup has many preservatives and is higher in carbs.

Making this keto mushroom soup is a breeze. In no time, you will be enjoying a warm, satisfying bowl of this heartwarming and nutritious soup! To save time, you can make it on the stove or in the instant pot.

Ingredients Used

  • Mushrooms: I use baby bella mushrooms, but you can use your favorite mushrooms or a variety of mushrooms to make this soup. I like to buy my mushrooms already pre-sliced to save time, but you can buy them whole and slice them yourself.
stock, heavy whipping cream, olive oil and spices
  • Heavy whipping cream: This helps to increase the fat content of the mushroom soup and make it more filling.
  • Cream cheese: Cream cheese makes the soup really creamy and acts as a thickener.
  • Spices: Cayenne pepper, black pepper, bouillon powder, salt, and thyme.
  • Aromatics: Onions and garlic.
  • Chicken broth.
  • Olive oil.
raw sliced mushrooms in a bowl

How To Make Keto Mushroom Soup

  1. Wash your mushrooms under running water in a colander and let them drain. If using whole mushrooms, slice them up. When done, chop the onions and mince the garlic, and set aside.
  2. Warm olive oil over medium-high heat on a stovetop. Sauté the onion and garlic until translucent.
  3. Add the mushrooms, salt, and black pepper and let it cook for about 5 minutes. Stir the mushrooms frequently so they do not burn.
  4. Add your chicken stock, bouillon powder, cayenne pepper, and thyme. Continue stirring, making sure that the browned bits come off the bottom.
  5. Bring everything to a boil, then turn down the heat and allow it to simmer for 10 minutes. Add the heavy cream and cream cheese to the soup.
  6. Cook for five more minutes so there are no big clumps of cream cheese. Remove the soup from the stove and allow it to cool a bit.
  7. Use an immersion blender or pour into a regular blender and blend until smooth. Put your soup back on the stove and check the seasoning. Add a bit more salt and black pepper if necessary, and simmer for a few minutes on low heat.
four collages showing how to prepare mushroom soup
side by side images of mushroom soup cooking on the stove

Make this soup in an instant pot

  1. Saute the onions and garlic in the instant pot in sauté mode. Add the mushrooms, salt, and black pepper and cook for about 5 minutes, stirring often.
  2. Then, add your chicken stock, bouillon powder, cayenne pepper, and thyme. Set the instant pot to manual mode and set the pressure to 5 minutes. The instant pot will take a few minutes to get pressure.
  3. When the timer goes off, quick-release by turning the steam release knob from sealing to venting. Switch the instant pot back to sauté mode.
  4. Add the heavy cream and cream cheese and stir. Let the soup simmer and thicken some more.
  5. Use an immersion blender or pour into a regular blender and blend till smooth.
  6. Pour the soup back into the instant pot (sauté mode), and check the seasoning. Add a bit more salt and black pepper if necessary, and simmer your soup for a few minutes.

Recipe Video

Click on the image below to watch me make this recipe from start to finish on YouTube!

keto mushroom soup youtube thumbnail

Can I use frozen mushrooms for this soup?

Yes, frozen mushrooms will work well for this soup. Freezing mushrooms does change their texture and color, but since they will be pureed in the soup, you don’t have to worry so much about that. Make sure you defrost them in the microwave before using them.

Storing and Reheating

It is best to store this keto mushroom soup in airtight containers in the fridge. Warm it in a small pot on the stove to reheat, and you’ll be good to go.

Since this soup has dairy products in it, it won’t freeze as well. The milk’s fat content might start to separate from the liquids and give you a grainy or watery texture.

What can I eat this recipe with?

You can serve this keto mushroom soup with a side of vegetables like asparagus, brussels sprouts, mixed veggies, or roasted cauliflower. My favorite side dish to eat this soup with is my keto fish cakes.

A bowl of keto mushroom soup with a spoon on the side

Helpful Tips

  • When blending this mushroom soup, you can make it smooth or chunky, depending on your preference. I like to blend half of it and pour it back into the mixture. The result is a semi-smooth mushroom soup with some chunks in it.
  • Omit the cayenne pepper if you want it less spicy.

Check out these delectable keto soups!

keto mushroom soup with extra mushrooms on top
Keto Mushroom Soup

Keto Mushroom Soup

This keto mushroom soup is a wonderful alternative to store-bought cream of mushroom soup. It has a soothing, earthy flavor that is so nourishing and comforting!
5 from 33 votes
Print Pin
Course: Soups & Stews
Cuisine: American
Diet: Gluten Free
Prep Time: 5 minutes
Cook Time: 25 minutes
Total Time: 30 minutes
Servings: 4
Calories: 391kcal
Author: Tayo Oredola

Equipment

Ingredients

  • 4 cups mushrooms sliced. I used baby bella mushrooms but you can use any.
  • 1/3 cup olive oil
  • 1/2 cup onion chopped
  • 1 clove garlic minced
  • 1/2 cup heavy whipping cream
  • 4 cups chicken broth
  • 4 oz cream cheese
  • 1/2 tsp black pepper
  • 1/2 tsp cayenne pepper
  • 1/2 tsp thyme
  • 1/2 tsp bouillon powder
  • 1/2 tsp salt or to taste

Instructions

  • Chop the onions and mince the garlic.
    1/2 cup onion, 1 clove garlic
  • Slice the mushrooms, if they are whole.
    4 cups mushrooms

Make it on the stove

  • Sauté onions and garlic in olive oil till translucent.
    1/3 cup olive oil
  • Add mushrooms, salt, and black pepper and stir for 5 minutes.
    1/2 tsp salt, 1/2 tsp black pepper
  • Add chicken stock, bouillon powder, cayenne pepper, and thyme.
    4 cups chicken broth, 1/2 tsp cayenne pepper, 1/2 tsp bouillon powder, 1/2 tsp thyme
  • Stir and scrape the browned bits.
  • Bring to boil and simmer for 10 minutes.
  • Mix in heavy cream and cream cheese.
    1/2 cup heavy whipping cream, 4 oz cream cheese
  • Cook for 5 more minutes.
  • Blend with an immersion blender or pour into a regular blender.
  • Put back on the stove and adjust seasoning.
  • Simmer for 3- 4 minutes on low heat.

Make it in the instant pot

  • Sauté the onions and garlic in the instant pot on sauté mode.
  • Add the mushrooms, salt, and black pepper and cook for about 5 minutes, stirring often.
  • Add your chicken stock, bouillon powder, cayenne pepper, and thyme.
  • Set the instant pot to manual mode and set the pressure to 5 minutes. It will take a few minutes for the instant pot to come to pressure.
  • When the timer goes off, quick-release by turning the steam release knob from sealing to venting.
  • Switch the instant pot back to sauté mode.
  • Add the heavy cream and cream cheese and stir.
  • Let the soup simmer and thicken some more.
  • Blend using an immersion blender or regular blender.
  • Put back in the instant pot and adjust seasoning, if you wish.
  • Simmer for a few more minutes and serve.

Video

Notes

This recipe serves 4 and contains 5 net carbs per serving. Each serving is 1 cup.
  • When blending this mushroom soup, you can make it smooth or chunky, depending on your preference. I like to blend half of it and pour it back into the mixture. The result is a semi-smooth mushroom soup with some chunks in it.
  • Omit the cayenne pepper if you want it less spicy.

Nutrition

Calories: 391kcal | Carbohydrates: 6g | Protein: 6g | Fat: 29g | Saturated Fat: 20g | Cholesterol: 31mg | Sodium: 1312mg | Potassium: 532mg | Fiber: 1g | Sugar: 3g | Vitamin A: 381IU | Vitamin C: 19mg | Calcium: 45mg | Iron: 1mg