Turn your Instant Pot to sauté. Add 1 tablespoon (15 ml) of oil and cook the onion until translucent, 3 to 5 minutes. Add the garlic and sauté for about 3 minutes.
Turn the sauté off. Add in the water, soaked beans, sun-dried tomatoes, oregano, basil, thyme and bay leaf to your Instant Pot. Place a rack with 2- to 3-inch (5- to 7.5-cm) legs into the mixture. This is not the rack that came with your pressure cooker.
You can then place a 4- to 5-cup (960-ml to 1.2-L) Pyrex container or one of the stainless bowls from the stackables you can buy for your Instant Pot. Use a 4- to 5-cup (960-ml to 1.2-L) container that fits on top of the rack and allows the lid to close. In the container, combine the water, polenta, nutritional yeast and 2 teaspoons (10 ml) of olive oil (if using). Whisk well.
You will not cover or put a lid or foil on this.
Cook on high pressure for 25 minutes. Let the pressure release naturally for 10 minutes and manually release the pressure the rest of the way.
Carefully remove the top container and set on a trivet. Whisk and whisk some more and the polenta will be the perfect texture.
Check to make sure the beans are fully cooked; if not, place the lid back on and cook for 5 minutes. Remove the bay leaf. Stir the kale into the beans, and add salt as needed to both dishes.
Serve the white beans on a bed of polenta.