Press the "Sauté" setting. Cook the bacon until they are crispy. Remove the bacon bits from the pan and leave ¼ cup of bacon grease in the pot.
Add chopped onions and cook until translucent. Add garlic and stir for 15 seconds. Turn off the"Sauté" setting.
Add potatoes and broth. Scrape the bottom of the pot to keep the pan clear and nothing is stuck on it to prevent burning.
Select the "Manual" setting and adjust it to "10 minutes". When cooking is complete, use a natural release to depressurize then open the lid.
Select the "Warm" setting. Transfer ⅔ of the soup to a blender and puree it. Return the pureed soup to the IP and stir.
Select the "Saute" setting. Bring soup to a simmer. Add sour cream, bacon pieces, and milk. Keep stirring until well combined and until you reach the desired consistency. Don't let it boil, or the dairy will curdle. Add salt and black pepper if needed.
Serve with fresh herbs (green onion) and bacon bits if you reserved some for garnish.
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