In the Instant Pot® bowl, pour 1 cup of water, insert the rack and place the sweet potatoes on top.
Close and lock the Instant Pot® lid. Make sure the steam release handle is turned to Sealing. Press Pressure Cook, pressure level High, and set time to 18 Minutes.
When done, press Cancel and turn the steam release handle to Venting. Once all the pressure has been released, remove the lid and remove the sweet potatoes. Set aside. Remove the rack and pour out the water.
In the Instant Pot® pot, add the olive oil, garlic, onion, beans, peppers, salt, chili powder, cumin, cinnamon, and water. Stir. Close and lock the lid, following the instructions from step 1. Press Pressure Cook, pressure level High, and set time to 22 Minutes .
When done, press Cancel and turn the steam release handle to Venting. Wait for all the pressure to be released before removing the lid. Stir the bean chili.
Put the cooked sweet potatoes on a plate. With a knife, cut lengthwise and fill with the bean chili. Serve with guacamole and basil leaves.