So the main ingredients in this creamy chicken soup are mushrooms, spinach, chicken and cauliflower cream sauce. Add spinach and broth and simmer 5 minutes, to allow flavors to blend. Let this creamy chicken and spinach keto soup keep you feeling full without extra carbs! Super quick and easy to make. This Instant Pot Keto Chicken Soup is the ultimate in low carb comfort food. Creamy Chicken & Spinach Soup Ingredients . The result was a delicious and nourishing keto spinach soup that was hearty enough for a meal with only 135 calories and 4.0g net carbs. Learn this Keto Spinach Soup for a delicious and nutritious spinach soup that's perfect during cold season. Finish with nutmeg and season to taste with salt and pepper. Add cream and cook on low until heated through. Plus its made in the Instant Pot so it’s fast and easy to prepare. Purée soup using an immersion blender, or if using a regular blender puree in small batches with the lid slightly vented so the steam can escape and return to pot.