Mushroom Onion Soup

This is a mushroom onion soup that’s packed with flavor and easy to make, so you can whip together a batch in no time. Earthy mushrooms and sweet caramelized onions add flavorful taste and nourishment that warms the bones deep to the soul.

A fragrant caramelized mushroom and onion soup that keeps you warm and full! It is packed with savory flavor and a thick broth making it the perfect food for a cold night or a casual dinner. Serve this easy soup with crusty bread for a complete meal.

This recipe was inspired by having mushrooms and onions around the house! It uses simple ingredients, like my tomato basil soup on this site, and pairs well with breadsticks or fresh batch of homemade sweet bread rolls. Mushroom onion soup is easy enough for anyone to make and a must-have for the home cook!

Jump to:
  • Easy Ingredients
  • Instructions how to make mushroom and onion soup
  • Substitutions
  • Variations
  • Equipment
  • Storing mushroom onion soup
  • Top tip for prepping soup and meals
  • FAQ
  • Related Recipes
  • Pairing
  • Mushroom Onion Soup
  • Food safety

Easy Ingredients

We chose the simplicity of cremini or button white mushrooms that you can easily find in the grocery store. Vidalia onions are sweeter than yellow onion, white onions, and red onions so they add a beautiful sweetness combined with the earthy taste of mushrooms.

Try topping mushroom onion soup with a sprinkle of truffle zest or shaved black or white truffles!

  • butter – you can use vegan butter
  • Cremini mushrooms
  • Vidalia onions
  • garlic cloves
  • cornstarch
  • broth – beef broth, vegetable broth, bone broth, or chicken broth
  • water
  • dry white wine
  • tomato paste
  • pink Himalayan salt
  • black pepper
  • fresh parsley leaves

See recipe card for quantities.

Instructions how to make mushroom and onion soup

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Wash mushrooms in water and rinse off the onion. Remove skin of onion and cut in half then into thin slices. Slice mushrooms.

Heat butter, onion, and mushrooms in a pan until darkened. Then add the garlic.

Mix in the cornstarch to make a roux.

Add broth, seasonings, wine, tomato paste and bring to a boil. Turn down the heat and simmer 20 minutes.

Hint: As you keep sautéing the onion and mushrooms, continue stirring frequently as it cooks. This helps to prevent burning and sticking to the pan.


  • Onion – instead of Vidalia onion you can substitute it with yellow onion.
  • White wine – in place of white wine and using alcohol in soup, you can substitute it with ¼ cup white wine vinegar and ¼ cup of water. Or ¼ cup lemon juice and ¼ cup of water.
  • Beef Broth – in this broth for mushroom onion soup, we make it with chicken bone broth or vegetable broth. You can make it with beef broth too. If using beef broth substitute white wine for red wine.


Looking for a little extra heartiness in mushroom and onion soup? Try this satisfyingly delicious variations!

  • French mushroom onion soup – after the soup is cooked, place some soup in 16 ounce ramekins on a baking sheet. Top with a slice of swiss cheese or Haveri cheese then a slice of bread. Bake in the oven at 350 degrees F until the cheese melts and the top of the bread is crisp.
  • Deluxe – add cooked sausage like chicken sausage cut into slices or coins. Or add turkey meatballs to the soup. You can also add shredded chicken or rotisserie chicken.

See this slow cooker shredded chicken on my website that you can use in this soup!


Equipment for soup is just a large pot to simmer the mushroom onion soup in. You can use either a non-stick nontoxic pan, or stainless steel pan. Since we saute the vegetables in oil or butter first, sticking is not a concern.

I recommend using an enamel cast iron Dutch oven pot or stainless steel pot like these (affiliate links).

Storing mushroom onion soup

Store leftover soup in the refrigerator in an airtight container for up to 5 days. To reheat, bring it to a boil then reduce to a simmer for about 5 minutes before serving.

These ingredients freeze well! Store the cooked soup in a freezer bag and seal it tight, removing all the air. Store it in the freezer laying flat so it thaws quickly. It lasts in the freezer for about 3 months.

Top tip for prepping soup and meals

  • Meal prep! Meal prepping saves so much time in the week and and at the end of the day because food is ready to grab and cook without the hassle of chopping and cooking. How much time do you think that saves… 10-20 minutes per meal? That is a lot of time once you add it up.
  • Wash and store extra mushrooms and onions for another weekly meal. A big tip is to wash and slice a large batch of Cremini mushrooms or white mushrooms and onions and set them in the refrigerator in air-tight containers to use throughout the week. That way you have fresh mushrooms to quickly grab from the fridge any time you need. Use the prepared mushrooms for a healthy snack with cashew dip, in mushroom and onion soup, and as Friday night pizza toppings!


Is mushroom soup healthy?

Yes! Mushroom onion soup is very healthy and full of anti-inflammatory properties, along with cancer and heart disease prevention. Since the soup is mostly vegetables it is low calorie and wonderful to add to a weight loss diet.

What is the healthiest soup in the world?

Soups that are plant-based and low calorie are considered among the healthiest soups in the world. This mushroom onion soup is on the top of the list when made with chicken bone broth, which contains protein or vegetable broth. Try these other healthiest soups:
Easy Vegetable Soup
Cabbage Diet Soup
Zucchini Zoodle Ginger Soup
Healing Rice Soup With Vegetables

What does mushrooms do to the body?

Mushrooms are rich in Selenium and antioxidants. Higher consumption of this medicinal fugi is known to help reduce the risks of certain types of cancer, and reduce certain health conditions such as Alzheimer’s Disease, diabetes, inflammation, and heart disease.

Looking for other recipes like this? Try these:

  • Sausage Stuffed Portobello Mushrooms With Spinach
  • Vegetarian Spinach Cranberry Mushroom Wreath
  • Mushroom Vegetable Chili Soup
  • Easy Vegetable Soup


These are my favorite dishes to serve on the side with mushroom onion soup, along with air fryer potato wedges:

  • Gluten Free White Bread Recipe
  • Breaded Baked Zucchini Slices
  • Crunchy Gluten-Free Breadsticks
  • Gluten-Free Cornbread Muffins

If you make this mushroom onion soup from Delightful Mom Food I would love to see your creations and share it! Follow along with me on INSTAGRAM, PINTEREST, FACEBOOK, YOUTUBE and TWITTER to be featured and for more recipe inspiration! And don’t forget to rate the recipe in the recipe area and leave a comment below!

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