Wash, peel and dice the sweet potatoes.
Dump the sweet potatoes, coconut milk and maple syrup into the Instant Pot.
Seal Instant Pot and set to 10 minutes on high pressure. Let cook.
Preheat oven to 350°F
While the sweet potatoes are cooking in the Instant Pot, dump pecans, coconut sugar and cinnamon into either a Food Processor or a Hight Speed Blender.
Process the pecans, coconut sugar and cinnamon until it forms crumbles. This will be the topping for the casserole.
After the sweet potatoes have finished cooking in the Instant Pot, allow them to depressurize naturally for 10 minutes, then manually depressurize.
Open the Instant Pot (making sure not to get burned by the steam), and add the vanilla and salt.
Use an immersion blender (or hand mixer) to cream the sweet potatoes.
Transfer the sweet potatoes to an oven safe baking dish and sprinkle the pecan topping all over the top. (If you have extra topping, save it in a jar—it's awesome on top of oatmeal.)
Bake for 10 minutes at 350°F