Add the olive oil to an electric pressure cooker. Turn to saute, add the onion and ¼ teaspoon of the salt and saute for 7 minutes, stirring occasionally.
Add the turmeric, potatoes, sweet potatoes, 1 cup of the corn, garlic, ¾ teaspoons of salt, chicken, and stock, stirring to combine.
Secure the lid, select the manual setting, and set it to high pressure for 15 minutes.
When the pressure cooker timer is done, quick release the pressure.
Carefully remove the chicken and shred with two forks or chop into bite sized pieces. Set aside.
With an immersion blender, blend the chowder in the pressure cooker until creamy. If you don’t have an immersion blender, carefully ladle the soup, in batches, into a blender and blend until smooth. Return the blended mixture back to the pressure cooker.
Add the coconut milk, vinegar, remaining 2 cups of corn, and shredded chicken, stirring to combine. Taste and add additional salt or vinegar to taste. Serve with basil, scallion, and hot sauce if you like.