The most important thing to know about steamed Instant Pot sweet potato cubes is that the size of the cubes (or chunks) determines the cooking time.
For 1x1x1 inch cubes or 1/2-inch thick rounds, 5 minutes will give you a soft texture that is easily pierced with a fork but the pieces still hold their shape.
If you want a firmer texture, try 3 minutes. If you want a very soft texture, try 8 minutes.
See the Notes section for cooking instructions for whole, steamed sweet potatoes.
Remember, it's best to error on the side of undercooking the sweet potatoes, because you can always secure the lid again and cook the potatoes for a few more minutes.
*Slightly smaller or larger cubes are okay, such as ¾-inch cubes or 1 ½-inch cubes. You don’t have to cut precise cubes. The most important thing is that all of the chunks are about the same size. See the blog post section above "How to Cut Sweet Potatoes" for links to videos that show how to cut sweet potato cubes.
This recipe was tested in a 6-quart Instant Pot.
Instead of cubes or chunks, you can also cook rounds of sweet potato that are 1/2-inch thick using this cooking time and method.
If the sweet potato is not as soft as you'd like, then either set the lid back on the pot and let the potatoes steam longer in the residual heat or secure the lid and cook the potatoes for 1 to 3 more minutes.
These potatoes are soft enough to mash with a fork, but if you want really soft, creamy sweet potato cubes then increase the cooking time to 8 minutes.
Using a steamer basket yields the best results because it keeps the potatoes from getting waterlogged and soggy.
Step 1: Prick the whole sweet potato several times with a fork.
Step 2: Pour 1 cup of water into the Instant Pot. Set a trivet or steamer basket over the water.
Step 3: Arrange the sweet potatoes in the steamer basket. They can be laying flat or standing straight up.
Step 4: The cooking time depends entirely on how large the potato is.
Small, skinny sweet potatoes = 15 to 20 minutes
(1 to 2-inches diameter and less than 6 inches circumference)
Medium sweet potatoes = 25 to 35 minutes
(2 to 3-inches diameter, 7 to 10 inches circumference)
Large "jumbo" sweet potatoes = up to 60 minutes
(3.5 to 4-inches diameter, 11+ inches circumference
Step 5: Let the pressure release naturally after the cooking time is complete.
Find it online: https://www.kitchenskip.com/instant-pot-sweet-potatoes-cubed/