Peel potatoes if desired, then cut into 1-inch cubes. Place into a multi-functional pressure cooker (such as Instant Pot) with water and bouillon cubes. Select Sauté function and cook for 4 minutes.
Stir potatoes and water and break up bouillon cubes. Close and lock the lid. Select high pressure according to the manufacturer's instructions; set the timer for 10 minutes. Allow 10 to 15 minutes for pressure to build.
Release pressure using the natural-release method according to manufacturer's instructions, about 10 minutes. Release remaining pressure carefully using the quick-release method. Remove the pot and carefully drain off most of the liquid.
Add sour cream, butter, and milk. Gently mash with a potato masher to reach your desired consistency.
Nutritional Facts
Per 4 servings
Calories: 386
Carbohydrate: 28g
Fat: 29g
Fiber: 2g
Protein: 5g
Sugar: 0g
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