Wash and peel 3 pounds sweet potatoes, then cut them into 1-inch cubes. Place them into the inner pot along with 1½ cups liquid of choice and ½ teaspoon kosher salt.
Place the lid on Instant Pot and seal the venting knob or lock the lid. Using the manual or pressure cook function, set the cooking time to 10 minutes on high pressure.
Once the cooking time has elapsed, allow the pressure to release naturally for at least 5 minutes. After 5 minutes, you can opt to do a quick release of the remaining pressure OR you can allow for the pressure to release naturally on its own.
Drain the potatoes, reserving the cooking liquid. Place the sweet potatoes back into the inner pot, and using hand-held masher, mash until creamy, adding some of the reserved cooking liquid until the right consistency has been reached. Alternatively, process cooked sweet potatoes in a food processor or blender and process with some of the cooking liquid until smooth.
If desired, add butter, milk, and/or additional seasonings and continue to mash the sweet potatoes until they are creamy.
Notes
Storage: Leftover mashed sweet potatoes can be stored in the refrigerator for up to 5 days and can be frozen for up to 3 months. Cooking Liquid: Use water or apple juice for sweet preparation and water or broth for savory variations. For Baby Food: Omit salt, cook in water (or 100% apple juice) and puree in blender or food processor until smooth.Spiced Mashed Sweet Potatoes: Add 2 teaspoons minced jalapeno and 1 teaspoon smoked paprika to cooking liquid before cooking. Creamy Mashed Sweet Potatoes: After cooking the sweet potatoes, add ¼ cup milk and 1 tablespoon butter and mash until creamy.Sweet Mashed Sweet Potatoes: Use apple juice or water as the cooking liquid. Once cooked, add 1 tablespoon of maple syrup, 1 teaspoon of cinnamon, and ½ teaspoon of nutmeg and mash as directed. Top with chopped nuts if desired.Apple Cider Mashed Sweet Potatoes: Use apple cider as your cooking liquid and flavor with 1 teaspoon cinnamon and ½ teaspoon grated nutmeg before mashing. Tex-Mex Mashed Sweet Potatoes: Replace salt with 2 teaspoons of taco seasoning. When mashing, add up to ¼ cup of sour cream to add tang to the sweet potato mash.Bourbon Mashed Sweet Potatoes: Add 1 tablespoon of bourbon into the cooking liquid before cooking sweet potatoes. Season with a bit of cinnamon if desired.