Place your sweet potatoes on a rack inside of your instant pressure cooker along with two cups of water. Use the manual setting and place on high. Let cook for 22 minutes.
While the sweet potatoes are cooking, begin prepping the remaining ingredients, by placing them in the mixing bowl you intend to use for whipping the sweet potatoes.
Once the sweet potatoes are done cooking let them cool before removing the skins. Transfer each of them to the mixing bowl along with the rest of your ingredients.
Using an electric whipping tool (similar to a whisk) begin whipping all of the ingredients together.
Garnish with additional vegan butter, walnuts, and cinnamon (optional). Enjoy!