Combine vegetable stock, cauliflower, potatoes, carrots, onion, salt, and pepper in a multi-functional pressure cooker (such as Instant Pot®). Close and lock the lid. Select Soup/Broth setting according to manufacturer's instructions; set timer for 10 minutes. Allow 10 to 15 minutes for pressure to build.
Release pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid. Use an immersion blender to carefully puree soup until smooth. Drizzle olive oil once soup is smooth with the blender running.
Taste soup and season with more salt and pepper, if needed.
Nutritional Facts
Per 6 servings
Calories: 161
Carbohydrate: 16g
Fat: 10g
Fiber: 4g
Protein: 3g
Sugar: 4g
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