Toss sweet potatoes with cornstarch in a resealable plastic bag until evenly coated.
Place coated sweet potatoes in a multi-functional pressure cooker (such as Instant Pot®). Cover with maple syrup, white sugar, brown sugar, and margarine. Pour in water and stir. Close and lock the lid.
Select high pressure according to manufacturer’s instructions; set timer for 4 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.
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