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close up of grilled cheese sandwich dipped in a bowl of keto tomato soup
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5 from 1 vote

Instant Pot Tomato Soup (Keto)

Instant Pot tomato soup is a creamy soup made mostly with pantry staples in 30 minutes. It is keto, healthy, vegetarian, and super comforting, making a great pair for grilled cheese sandwiches.
Course:Main Course
Keywords:creamy, instant pot tomato soup, keto tomato soup
Prep Time 5 minutes
Cook Time 20 minutes
Pressure release 5 minutes
Total Time 30 minutes
Servings 4 people
Calories222.8 kcal
Cost $ 1.50 per person



  • 1 tablespoon extra virgin olive oil or regular olive oil
  • 1 sweet onion diced (e.g. Vidalia)
  • 2 cloves garlic minced
  • 1 cup of canned fire-roasted tomatoes or you can roast fresh tomatoes
  • cup low-sodium vegetable broth or chicken broth if you prefer
  • 16 oz marinara sauce choose one without added sugar such as RAO's, or homemade Pomodoro sauce
  • 2 teaspoon granular sweetener e.g. Erythritol
  • 1 tablespoon tomato paste not tomato sauce
  • ¼ cup chopped fresh basil preferred, or ½ tablespoon dried basil plus extra to garnish
  • ½ teaspoon Italian seasoning
  • Salt and ground black pepper to taste
  • cup heavy cream or enough to get to your ideal thickness. If you prefer, use Greek yogurt
  • 2 oz cream cheese softened
  • ¼ teaspoon xanthan gum You can omit it if you don't have it and add extra 1-2 oz cream cheese to the soup


  • Turn on the sauté function of your Instant Pot and let it heat for about 2 minutes. Sauté the onion for 3-4 minutes, stirring now and then, until tender. Add the garlic and cook for 30 seconds while stirring.
  • Stir in the roasted tomatoes and then the broth to deglaze any browned bits of the onion from the pot.
  • Add the marinara sauce, sweetener, tomato paste, and seasonings (basil, Italian seasoning, salt, and pepper).
  • Turn off the sauté function. Lock the lid, turn the valve to sealing, and set it to HIGH pressure for 15 minutes. After cooking, let the pressure release naturally, for about 5-10 minutes.
  • Unplug the Instant Pot and add the cream, cream cheese, and xanthan gum. Use a handheld immersion blender to puree the tomato soup until smooth. Alternatively, you can blend the soup, in 2 batches, either in your blender or food processor.
  • Adjust the broth and seasoning to taste to get to your ideal thickness and flavor.
  • Serve hot with a melty low-carb grilled cheese sandwich.

Recipe Notes

Refrigerate leftovers in an airtight container for up to 3-4 days.
Reheat in a pot on the stovetop over medium-low heat, stirring now and then until hot. Or, cover the soup and reheat it gently in the microwave.
How to Freeze
Because this keto tomato soup contains dairy, the best way to freeze it is to puree the soup and leave the dairy out. Then, once the soup is cool, place it in a freezer-safe container for up to 2 months. 
Defrost in the fridge overnight and reheat the soup over medium-low heat. Then, whisk in the cream cheese, heavy cream, and xanthan gum until homogeneous and thickened to your desired consistency. 


Calories: 222.8kcal | Carbohydrates: 14.1g | Protein: 3.5g | Fat: 17.4g | Saturated Fat: 7.9g | Polyunsaturated Fat: 0.9g | Monounsaturated Fat: 5.6g | Cholesterol: 36.7mg | Sodium: 194mg | Potassium: 190.8mg | Fiber: 2.1g | Sugar: 8.4g | Vitamin A: 887.3IU | Vitamin C: 6.9mg | Calcium: 73.7mg | Iron: 0.9mg

** Nutrition labels on easyanddelish.com are for educational purposes only. This info is provided as a courtesy and is only an estimate, since the nutrition content of recipes can vary based on ingredient brand or source, portion sizes, recipe changes/variations, and other factors. We suggest making your own calculations using your preferred calculator, based on which ingredients you use, or consulting with a registered dietitian to determine nutritional values more precisely.

Please note that health-focused and diet information provided on easyanddelish.com is for educational purposes and does not constitute medical advice, nor is it intended to diagnose, treat, cure, or prevent disease. Consult with your doctor or other qualified health professional prior to initiating any significant change in your diet or exercise regimen, or for any other issue necessitating medical advice.

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